When the grand am is cold in the morning the car stumbles and sometimes it stalls. Then after I drive the car it runs normally. It is a 2.3l DOC quad 4, if the is an answer I would like to hear about it thank you
Have you checked the timing? Chances are the timing is off and you might have to replace the timing chain or belt, whichever one it has.
Bad temp sensor. Dirty MAF, MAT, MAP sensor.
Thinking about the O2 sensor and the rusty threads that form the ground, I hooked a large alligator clip to the sensor and the wire to the engine block. This assured a good ground. In the three cold starts since there has been no cold idle problems.
If you can't do this try loosening the O2 sensor and re tighten. Let me know if this helps.
the 2.3`s sometimes had a problem of developing condensation on the coil packs and mis firing...take a look at the boots coming from the coils to the plugs for signs of moisture and spark-arcing....
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