Originally Posted by lsmalley

I pretty much replaced everything fuel, air, and spark related....but I noticed I did not check the injectors. After checking the injectors, several were spraying streams and non uniform patterns, I had some spare ones so I swapped them out as well as my cold start valve. While I had the fuel distributor off I also replaced the rubber boot at the bottom and also changed out the throttle position sensor. While I had everything off I removed the plugs and I used 2 cans of carb cleaner through the injector ports and cycled the engine after each series to clean everything. I noticed some residual oil washing out into the intake manifold so I continued until only clear carb cleaner came out. I buttoned everything back up and went on a test drive and no stumbling or hesitation. Idle was super smooth. I'm almost positive that the injectors were the problem, but since I replaced/changed so much it's hard to tell and I will not try to find out either