I have a 1990 with a 2.1 in it, the engine idle is erratic. When you barely push the throttle the rpms will bounce. I can't seem to locate the problem. I have unplugged the fast idle valve, unhooked the egr valve also. I am lost and need help
Thanks

Mine is doing the same thing, have you found any answers to the problem yet ? Is yours carbureted or fuel injected ?

Have you done any work on your car recently? One of the main causes of a bouncy idle is air in the cooling system. You could try bleeding the coolant. Here is a handy link that talks about the causes of a bouncy idle in a 3rd gen and how to fix the problem. It's pretty specific to fuel injected models though...
Bouncy Idle Fixes

In case you don't know about it, here is a website entirely dedicated to 3rd gens. Lots of helpful information here...
Prelude3G.com

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1991 Prelude Si ALB 4WS
2017 Ram Rebel

I think 1990 was the last year of carbed ludes.But not all had them. Luzer is right. It's usually air in the cooling system which needs to be bled or the iac valve itself.

Have tried all the usual suspects after discovering a broken wire at the fitv....or at least the stuff that causes the 5th idle bounce.

Thanks for the 3G specific info. Idle bounce with code was solved. Yet soon it began rough idle, no code. This should help.

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