Southern Alaska has had: (M1.5 or greater) 1  9 earthquakes in the past 24 hours. 2  54 earthquakes in the past 7 days. 3  294 earthquakes in the past 30 days. 4  5,169 earthquakes in the past 365 days.
An engines idle speed is a programmed function. We cannot directly adjust the engine idle speed on a modern vehicle. The power control module or PCM provides all adjustments to the idle speed. Though no external engine idle speed adjustments are possible, many things can and do cause problems.
Funky MAF. A malfunctioning MAF sensor can cause a wild up/down engine idle speed (say, 0-2,000 rpm). This might be caused by a loose harness connection or by a damaged or contaminated sensing wire. The MAF sensor measures the amount of air flowing through the throttle valve.