Questions & Answers for: causes rpms jump idling

...causes the nice smooth idle. When they go bad, it won't idle, jumping from hi rpms to low enough to cause the car to die. The ones that I've replaced were easy to access and replace, usually on the ...

...6, 4 cyl has erratic idle. Idle will jump between 500 to 1000 rpms. Runs fine when pressing on accelerator. What might cause this? M.a.P. sensor, air leak in intake system, low or erratic fuel ...

...over 2000rpms in park) but it is only doing it sometimes whats wrong ? It may be your idle control sensor. It would cause your vehicle rpms to jump. I'd bet you have a hole in a vacum line

please help ill do anything. Thanks for choosing FixYa and welcome. You may want to try a new MAP sensor. This sensor can cause the rpms to jump as this. Make sure the throttle is not sticking as well

...jump up to 2100 rpms and then drop back down to 1400 rpms. If your check engine light is on have it scanned for fault codes. Also check to make sure you don't have a vacuum leak, you could of ...

i cleaned out my choke with correct spray and now just replaced my idle air control sensor but the car is still the RPMs keep going up 3-4k and keeps going could it be the IDLE Speed Control Sensor ...

my idle rpms mysteriously jump from normal to anywhere between 1000 to over 3000. What causes this? could be a idle speedcontrol senser

...rpms. The best way to describe the judder is it reminds me of a bus starting off on a hill and giving that back and forth jerking as it is accelerating. Any answers would be much appreciated. Try ...

...speed between 40 -85 the rpms jump up and down but in idle it does not what will cause this i have a 4 barrel rochester carb that is electric Does it feel like it is shifting in and out of overdrive

...then go down to normal also when the rpms go up my temp gauge goes up Check for vacuum leaks. If it's an older car, vacuum lines get brittle and can break. It causes all sort of problems like