Contour Enthusiasts Group Archives Forums General Troubleshooting Here is something new... (BIG problem)

maybe ur timing is off? have ur plugs changed by a good shop and see if it gets better. the rough idle may have something to do with ur alternator so how old is it? he brakes and then a/c all use battery power and a failing alternator could disrupt ur idle. when i bought my car the battery in it was very very old and worn out. it was fine for a test drive, but if u drove it for long enough (during a 24hr test drive) the lights would dim and the idle change during long braking and eventually it would stall during breaking and need to be jumped. the dealer replaced the battery and the car is incredible. so glad i overlooked that and bought it