Here is a little more info:
This started suddenly about a month ago. I thought it was the fuel pump because it acted this way about 2 years ago and the fuel pump was the cause. I also changed the fuel filter at that time. When the car is cold, it runs fine. After I changed these, I thought it was fixed because I drove it about 5 miles and it worked OK. My wife drove to town (20 miles) and it started doing it again. I scanned the PCM (OBD2)and I found the bank 1 sensor 2 O2 sensor had stopped reporting. Replacing the sensor fixed that problem. The engine still missed, but still ONLY AFTER IT WARMS UP. The things you suggest would also affect it when it is cold. I also tried another PCM, to no avail. If I stop, turn it off, then restart, it is OK until it goes into closed loop operation again, then starts chugging and missing randomly. Also, reverse doesn't work well (after it goes into closed loop). Any other ideas?
Thursday, August 11th, 2011 AT 8:57 PM