Off-idle stumble resulting from ported EGR

[Bohdan L Bodnar]

I've driven GM cars before (with and without computer-controlled EGR) and 
never experienced this problem.  A hesitation like this suggests other problems
such as:

1). incorrect TPS setting/erratic TPS operation at this point
2). slightly clogged injectors
3). incorrect ECT information being given to the computer
4). incorrect fuel pressure

I'm quite surprised that you're seeing these performance problems in so many
different engine.

Cordially,

Bohdan Bodnar