94 Accord EX
I just finished a auto to manual swap but still haven't got the 5spd ecu yet. The problem occured before the project though.

When you start the car it idles sort of high for a little bit and then idles down, normal. Then it randomly beggins to rev up to about 1.5k and fall down to 500rpm it will continue to do this bouncing untill you start to drive it, then as soon as you push in the clucth or put it in neutral..it bounces back and forth again. It used to only do this if you pumped the brakes now it does as explained above and when you pump the brakes it makes it more intense.

 

Fast idle thermo valve.

 

Yeah, I searched and It seems like it could be 3 or 4 different things, what I don't understadn is why my brakes affect it?

 

I know pumping breakes changes your vacuum pressure since booster works with intake vacuum. Check map sensor, idle speed control valve.

 

sounds about right. mine does that. burps and acts like a coffemaker till it warms up then idles fine. think there is a screen in there u can clean throttle body cleaner. ive not cleaned mine yet i just live with it.

 

the way you explained it, it could be vaccume leaks. Other problems I've come by was the Idle Air Control Valve gummed up and I had to blast it with carb cleaner. The fast fluctuation of the RPM also could indicate that the Throttle Position Sensor is out of wack or just unplugged. But a vaccume leak of the intake manifold fits better since your brakes escalate the problem.

hope this may help

 

could possibly be a bad vacuum assist unit.