TBI woes

[66gmcguy]

Originally Posted by ChevyTech

You have not mentioned anything about the distributor yet.
I would try a different Ignition Control Module in the distributor.
It sounds to me like the module could be switching back to the base timing mode for a second.
When you are in the distributor make sure the distributor shaft is not loose and can wiggle sideways.

These distributors also have problems with the shaft losing its magnetism but that usually shows up as a hard start or problems at lower RPMs.

A Cracked insulator on a spark plug can cause that same sensation. Also a torn plug wire boot. I usually could feel this best at a very light acceleration at about 40 MPH

It's a brand new distributor, and the shaft is nice and tight. It is a Cardone unit, but after experiencing the same symptoms as the old distributor, I replaced the ICM and pickup coil with ACdelco parts. Still no change from before. Spark plug wires are new, again with no change from before.

Could the ESC relay (or whatever the part is called that the knock sensor connects to) be causing this? I'm sort of doubtful of this since I swapped one over from another truck and it still did it, but I guess I shouldn't assume that that one was okay either.