WEIRD Quadrajet Throttle Issues?

[savatreatabvr]

Originally Posted by cadillac_al

Is this a new gasket? Normally those plastic inserts aren't an issue and they actually protect from over-tightening and warping the carb. So, you got 2 rebuilt carbs and they both idle too high? It must be something else but the only thing it could be is a massive vacuum leak. Does the carb set pretty even on the gasket with no rocking?

When I bought a rebuilt carb off ebay it ran perfect when i put it on the car and didn't even have to adjust the idle. Some guys do know how to set them up perfectly on the bench. It's strange that you are having such a problem with your carb since the guy you got it from apparently sells carbs regularly..

Yes it is a new gasket. I bought a couple this time since I'm pulling the carb off on a regular basis, lol!

[bnoon]

The only time mine has idled uncontrollably high was when the timing was way too far advanced. I was stuck around 2000 idle and both high and low idle screws were totally out, then I noticed I was mid 20's degrees BTDC!!! Oops! Dropped it back to 11-12 initial and was able to use my idle screws again.