input: Article: He told BBC Wales that the stress of two months of negotiations led to him suffering a heart attack 48 hours after the deal was finally struck.
In a new report on coalitions, Mr Morgan said stable deals depend on securing the backing of party members.
He advised leaders to "take your time".
The report - Working Together - has been published by the Electoral Reform Society as opinions polls suggest another hung parliament after the general election in May.
Writing in the report, Mr Morgan said many Labour members "profoundly distrusted" Plaid Cymru, but had to "ventilate the steam" of their "intense dislike" to reach agreement.
"Coalition is not abhorrent, and it doesn't make a country ungovernable," he wrote.
Mr Morgan said "legitimacy and negotiation" were key to successful coalitions, recommending special party conferences be held to agree the manifesto promises being dropped for the sake of a deal.
His hospital admission shortly after the 2007 coalition deal was said at the time to have been for "gastric problems".
Plaid Cymru ministers served in a coalition government with Labour in Cardiff Bay from 2007 to 2011.
Cardiff Central Liberal Democrat MP Jenny Willott, who has served as a junior minister in the UK coalition government, said in the report they had proved it could work.
"There have been problems between the parties, but they have been resolved and the Government has held together to the very end," she said.

Summarize.
output: Former First Minister Rhodri Morgan has admitted that coalition negotiations with Plaid Cymru after the 2007 assembly election "could have been fatal" for him.

input: Article: The Court of Arbitration for Sport (Cas) has upheld a World Anti-Doping Agency (Wada) appeal after the 34 players - past and present - were initially cleared.
The players, including 12 currently registered with Essendon, are suspended for the 2016 season.
It was alleged the players were administered a banned peptide.
The long-running case has been through several layers of Australian and international sports governance. Essendon coach James Hird was banned for 12 months and the team's sports scientist Stephen Dank - alleged to have administered the banned substance, which promotes muscle growth - is still appealing.
He was previously found guilty of "trafficking, attempting to traffic and complicity in matters related to a range of prohibited substances".
The 2012 investigation examined the club's player supplements and sports science programme.
Essendon chairman Lindsay Tanner said the club was "currently digesting the decision" and would provide a further response shortly.
The Cas panel ruled that the players, including skipper Jobe Watson, Dyson Heppell and Michael Hurley, were "significantly at fault".
Seventeen of the 34 have since retired or been delisted. The Australian rules season starts in March.

Summarize.
output: More than 30 players associated with Australian rules team Essendon FC have been banned for doping.

input: Article: Berahino, 23, is back at the club after being sent to a conditioning camp in France to help him lose weight and regain fitness.
His current deal expires at the end of the season and Albion have been in talks with him since the summer.
"We've made Saido an offer and we're trying to get him to sign," said boss Tony Pulis.
Berahino played for West Brom's under-23s against Brighton on 19 December, his second reserves game since returning to the club.
He has not featured for the first team since 10 September and his last goal came against Chelsea on 27 February.
But without an agreement the Baggies will lose him for a tribunal fee in the summer, and could see him go for almost nothing if he moves abroad.
He currently earns around £20,000-a-week and a new contract is expected to at least double his wages.
Discussions are ongoing with a release clause expected to be included in the deal.
"It's a fantastic offer. We've made it hoping the lad will sign, it's up to him and his people to come back and negotiate," added Pulis.
Albion pulled out of contract talks in 2014 when Berahino was arrested for drink driving, which he pleaded guilty to and was banned from driving for a year in January 2015.
And they also rejected several bids from Tottenham, the final offer rising to £23m, on deadline day 18 months ago.
That sparked a strike threat, via Twitter, from the Burundi-born forward after he scored 20 goals during 2014-15.
But he has netted just once in the Premier League since October 2015, although Crystal Palace and Stoke still made offers of around £20m in the summer.

Summarize.
output: West Brom have made a third contract offer to Saido Berahino despite the striker's troubled year.

input: Article: Police were called to Forest Farm Country Park, near Coryton, just after 16:45 BST on Thursday.
A 41-year-old man was pronounced dead at the scene.
Anyone with information is asked to call South Wales Police on 101.

Summarize.
output:
A 58-year-old man arrested after another man died at a country park in Cardiff has been released on bail pending further inquiries.