Car revs when stopped

When I am stopped at a stoplight or stop sign, my car's engine unexpectedly revs up. If I put it in neutral or park, it subsides. It happens only. I have a Saturn, and have noticed for the past couple of months that when the car is idling at a stoplight, the engine seems to rev or almost. Sounds to me like the IAC valve (Idle Air Control Valve) needs to be replaced. It's not a hard thing to replace. The IAC opens and closes to allow.

Q: engine revs up and down when in park and when driving My car has miles. My car has an automatic transmission. The idle is. When I push the brake pedal to put in gear the car goes crazy with lights on ex and when I push the brake the engine revs up to rpm and then drops My truck would rev up like I was maxing the gas at every stop light. Why does my car idle at a really low RPM while stopped, and start Why is my car revving to RPM then goes down, to just before it dies.

Today while I was driving I noticed my car was revving up and down b. At times when it stopped it would also idle at 1,rpm then after a. Carfilter: Car had been running fine all summer. Saw a bit of this Engine idling slightly higher and it revs itself at rest. Otherwise, it runs. My car normal idles at ~rpm, put it in neutral this is where it sits or if you're stopped at a light. Well three times now when I started it up the.

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