I'm not familiar with your car brand or model but I see you've been waiting a long time for a reply. What you described was very common on Chrysler products in the late '80s and early '90s. It was caused by a failed MAP sensor. Chrysler is the only manufacturer I'm aware of that has never needed a mass air flow sensor. On their engines, the MAP sensor had the biggest say in how much fuel was commanded to enter the engine. When it had just started to fail but wasn't bad enough to set a diagnostic fault code, the clue was the engine would stay running as long as the accelerator pedal was moving. The engine would stall as soon as the accelerator was held steady. Normally the throttle position sensor has very little say in fuel metering calculations, but in this case it became more important to the computer.
On your car, also look at that mass air flow sensor. It's in the fresh air tube between the air filter and the throttle body. There can't be any leaks or loose clamps on that hose. All air going into the engine has to go through that sensor to be measured so the right amount of fuel will be calculated.
Wednesday, March 4th, 2015 AT 2:30 PM