Why would a 2000 Pontiac Sunfire be chugging when idling in the morning and when you stop then start driving again?
Here is advice: * I had the same problem. By the sounds of it your EGR valve is gone. It's what lets the car know how much gas to put through n what not. * Change spark plugs; worked for me at 110000km * I have a 95 Sunfire, and a few years ago it did this. I did all the common fixes, but nothing worked. I had them check the computer for codes but none showed up. My car stalled at a dealer, and they pulled codes. It turned out that my fuel pump was shorting and they replaced that and it has worked great ever since.