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Originally Posted by Gary Gaukler
One other thought: You said it stumbles at idle for a while, and then it goes away. That could be another indicator that your fueling is off. The first couple of seconds at idle the car is in open loop: the o2 sensors won't correct the A/F ratio until they have warmed up. Hence you are running off some standard fuel maps. Once the car is idleing in closed loop, the o2 sensors correct the mixture.
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Gary,
That makes sense, would the maf have anything to do with fuel on start up when its in open loop? The interesting thing is the fact that after I reset the cel from the ecu the car ran fine. I let it sit for a few hours before I went to work and normally it would stumble on start up. Well, it didnt stumble at all but on the way to work the cel light came on. In the morning it stumbled a little. Its weird its getting progressively worse unless I reset the ECU. This kind of makes me think a sensor, not sure.