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Runs Great ....When Cold!


Stanley2187

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I have a 1991 GP with 3.1. When first started engine runs great, nice throttle response and never misses a beat. After a few minutes say 3 to 5 minutes engine will miss and lack power. Am I correct in assuming I may have a defective ECM?? This happens only when the engine reaches a certain temperature.

Please help.

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I would lead to believe it's an Oxygen Sensor, especially after warm up and the ECM goes into a closed loop.

I would start easy and replace that; what's been recently replaced? Any trouble codes?

 

- Eril

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