Idle / stumbling at low revs

[priapism]

My car has sporatic idle issues--the usual revs drop, raise up to 1800, rinse repeat thing. But it also sometimes stumbles at low revs (<2k) before clearing out with an occasional pop. Is that a symptom of the idler going bad as well?

I figured it was dirty injectors, I put a bottle of Techron in there and have gone through half a tank. I also squirted some carb cleaner in the idler and cleaned out a bunch of gunk but the problem only went away temporarily.

The car had been sitting for about 4 months before this happened, but ran perfectly before then.

[redhatpat]

Could be ICV or vacuum leak.

[priapism]

I sprayed a bunch of carb cleaner around the usual vacuum leak spots and the revs never went up. Manually checked the lines and didn't see anything.

[jlevie]

That sounds most like intake leaks. The only sure way of finding intake leaks is to have a smoke test run.

[priapism]

Any home remedies I can use? I've tried squirting carb cleaner all over and the idle didn't seem to change.

[jlevie]

There is no substitute for a smoke test. It will find leaks in places you'd never think to look and/or places where carb cleaner won't work.