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Originally Posted by Chupes
I was drivin' around one day and noticed that while I sit in my running 1999 Cavalier, at a stop light for example, it sort of shakes or vibrates randomly. It's sort of like feeling a bump... bubump... bump bump BUMP bubump... lol. So I took it to the mechanic, and he said that my coils probably went bad. So he replaced them and the car was fine for around 3 weeks. Then, the same thing started up again, and a couple days later the "check engine" light came on. Before I take it back to the mechanic I'd like to have some sort of idea what the problem might be, just so he doesn't give me a line of bull. Thanks for any suggestions on what could be the problem!
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first off which engine? 2.2L or 2.4L twincam
Second which trnasmission? 4 spped auto or 5 spped manual
Third how many miles?
Forth have the plugs ever been changed?
your would be equipped with 100k mile platinum plugs, that most likley are carbon traked along with the wires. one bad coil i could see, but both i would doubt. if the check engine light is blinking then it is a ignition related misfire. rough idle is often caused by carbon build up in the throttlebody and the fuel injectors getting gummed up. without actually having the DTC that is currently set, my only adivce is that you are most likley due to for a tune-up.