4cyl 95 Contour, automatic, 100k miles. When at full stop, the engine's RPMs jump noticeably every 5 seconds for about a second. Between the jumps the RPMs seem to be normal. When driving slowly (i.e. through a school zone) the car slightly jerks forward at the same rate as at idle. When driving at >20 mph the problem either does not exist or is not detectable. No CEL, no other side effects. Looks like the fuel economy is unaffected.
Any ideas?
Has anybody had this?
I searched the archives but nothing similar popped up...
Thanks!
95ContourGL
