The throttle position sensor (tps) could make the rpms vary.
my 1990 300zx is idling rough what could cause this?
Yes, it could.
A bad coolant temperature sensor is one thing that could cause an idling speed problem with a Peugeot 406. There could also be a problem with the idle control valve.
could be the timing belt
A worn or loose out of adjustment drive belt could be the cause.
Hey Dee ann==Not simply idleing the engine. If you had an extra load on it to cause it to overheat this could cause it. GoodluckJoe
No, but something that could cause uneven idle could cause the check engine light to turn on.No, but something that could cause uneven idle could cause the check engine light to turn on.
Could be your timing belt.
A bad bearing in the water pump could be one possibility.
Mapp sensor or you might need pugs and wires.
what is the cause of a heartattack ?
The thermistat could be bad, check to make sure the fan is kicking on.