Since this problem has so many possible causes, it is best to start with the cheapest, and work your way up.
Start with vacuum hoses.
Then spark plug wires.
Is the problem worse with the AC on? Does it idle rough, and if so, under what conditions?
Once you've eliminated the obvious problems, get a code scanner and see if there are any codes. You can google them to get the possible causes. However, the computer is not always right. Sometimes it gives a false reading.
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Wednesday, September 26th, 2007 AT 8:40 PM