porscheforfun

running around 900 to 1000 rpms in neutral . But once in a while a notice a shimmy when I am just sitting still like it has a mis . Any suggestions where to start for easy first then more technical

Chimera

Try cleaning your ISV. A search for "ISV" will yield lots of threads with information.

Doc

ChaseN

What he said. I was having the same problem, popped my ISV off about a week ago and doused it in throttle body cleaner. Idle is terrific now.

Richard Curtis

What they ^ said. If that doesn't solve the idle problem, check for vacuum leaks.

Steve Weiner-Rennsport Systems

Beyond ISV cleaning and checking for vacuum leaks, make sure your ignition system is in top shape: this means plugs, plug wires, caps & rotors.

superdylan

O2 sensor gets missed a lot. May want to check/change that too.

porscheforfun

I read a thread about the belts , does this affect the idle?

Richard Curtis

You're probably referring to the distributor belt (the primary belt is connected to the secondary distributor by a small, rubber belt... they have been known to deteriorate and break). While the car will run on one distributor if the belt breaks, it might not run long and catastrophic engine damage can result. You should check that (a) the belt is intact (see thread) and, (b) that the distributor vent kit has been installed.

I don't think running on one distributor will affect the idle noticeably, but I could be wrong. Big rule of fixing things: Consider the simple things first.

porscheforfun

Cleaned the ISV did wonders to the Idle , thank you rennlist members for the advice!