The turbocharged four cylinder was underpowered and wasn't considered appropriate for a vehicle of this type, while neither Chrysler or Mitsubishi had a V6 engine until 1986 when both the Chrysler LA 239 V6 engine and the Mitsubishi V6 appeared.
A four-cylinder turbocharged engine proved inadequate for the vehicle's intended purpose, as neither Chrysler nor Mitsubishi offered a V6 engine until 1986, when they introduced their respective V6 engines (the Chrysler LA 239 and the Mitsubishi V6).