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I can't say for sure what the exact cause is of it. however, i had a friend with a manual transmission Honda Civic that would do the same thing, he says it has something to do with the O2 sensor. so that gives you a starting point to find the problem
idle airflow metre is more than likely the problem
It may have a clogged (fouled) fuel filter.
What else can I help you with?
What would cause a car rev up and down by itself?
idle airflow metre or pipe may have come off carb check both
When my 94 town car is in park if you shoot a rev to the motor it will rev up then drop down below idle speed almost stall or stall but will restart again?
ID-ten-T error.
What makes a car idle up and down?
A car may idle up and down due to "Improper fuel mixture". (The fuel in the car may consist of an un-even balance of air or gas). However, there are a few other ways a car can idle up and down.
Why would a 1997 grand am gt idle rev up and down?
A vacuum leak can cause that.
Should you rev up your car continuously while starting?
no, you should let it idle and warm up a little bit.
What causes a Briggs and stratton engine idle speed go up and down?
The most common cause of engine surging (rev up and down) is a dirty air filter.
Why 86 Honda Prelude rev up and down?
check your idle air control unit also called an IAC motor
Why would a 93 Honda Civic idle up and down after you rev the car up?
Check the Idle Air Control. It might have carbon deposits and need cleaning. Also do the same for the throttle body intake. It might also need cleaning.
What does it mean when your car excelerates without having your foot on the gas?
More than likely it is your idle control sensor. It will idle, and then all of a sudden by itself rev up. If it continues to rev constantly your throtle cable may be broke, the spring, or possible the cable is catching on something
Why would your 1995 Chevrolet Monte Carlo idle real fast and then real slow rev up and slow down?
A vacuum leak or a dirty or defective Idle Air Control Valve will cause an unstable idle. jd
What is causing the high idle sound when you start your car?
Cars often idle fast when you start them up. The automatic choke will make the car idles fast for a while then the idle speed will slow down, once the engine warms up.
Why does your 1988 Accord auto tranny rev itself up when in park or neutral only Revs itself up between 1.5 - 2.3 on odometer but not all the time?
IT SOUNDS LIKE YOUR ICV. (IDLE CONTROL VALVE) YOUR CAR REVS UP AND DOWN RIGHT? JOSE
