new maf cold air running rough

[Injuneer]

At idle, the LTFT's are back to rational numbers 130 Left/126 Right. Seems like you have eliminated the vacuum leak.

The problem I see is that the car has not been driven much, and the LTFT's in the seldom used fuel trim cells are still up at ~150-160. When you roll into the throttle in the 1,000-1,500 RPM range, the PCM moves to a cell that still has the ~160 LTFT's in it and the engine is suddenly running excessively rich. The PCM is gradually moving these 160 LTFT's down, but you haven't driven enough for all this to work itself out.

Clear the LTFT's by pulling the PCM BAT fuse (under hood fuse box in 1995) for 30 seconds. Drive it over a wide range of throttle position/RPM so the LTFT's can fully develop. Then see if the hesitation is still there.

It's not going to show up with the car sitting still and playing with the throttle, or with cold engine. The PCM doesn't use the cells that are causing the problem until it's in closed loop and the car is actually being driven under load.

The hesitation seems to be a common lt1 issue but nothing really solid as a fix

Totally disagree with that statement. There is nothing inherent to a properly running, properly tuned LT1 that makes it prone to hesitation in that RPM range.

[brota]

Thank so so much I will try this out, I do appreciate you taking the time to look it over. I have driven a little more since this report was taken so I will keep driving.

=Injuneer;
Totally disagree with that statement. There is nothing inherent to a properly running, properly tuned LT1 that makes it prone to hesitation in that RPM range.

Well googling around hesitation at 1100 or 1200 came up