RPM fluctuation

[mountainman]

Cleaned the MAF and throttle body and checked around for vacuum leaks, which I didn't find. Still have fluctuation. Any other ideas?

[jcslocum]

Originally Posted by mountainman

Cleaned the MAF and throttle body and checked around for vacuum leaks, which I didn't find. Still have fluctuation. Any other ideas?

There's a LOT of hose on a Box, so you will need a smoke machine (easy to make) to get a full test. Duramertic would be helpful if you had one.

The booster was hard to test because it takes a bit of vacuum to pull it down to check. A vacuum pump is helpful. We could hear ours leaking with my head under the dash when that car was idling.

[mountainman]

Took off the throttle body intake tube and had a little bit of oil in it and also in the hose running over to the AOS. Not enough to be smoking or anything, but enough to dirty up a towel. Wondering if an aos starting to go bad could cause the rpm to fluctuate at cruising speeds. Also thinking about taking off the resonance tube while I am in here and clean it. Anything to look for with it that could cause an rpm fluctuation or vacuum leak? Trying to cover all the bases while I have it apart.