Originally Posted by
Swampmonster
I am somewhat new to HP tuners but come from the world of Standalone EFI systems. I took a precursory look at your tune and log. In the log I didnt see any 02 voltages in the log. in the tune I looked at parameters to enter PE and noticed that 90 percent throttle was needed to enter. On a standalone speed density system when it has a lean stumble it is due to not enough acceleration fuel enrichment. A Map sensor car struggles with a sudden opening of the throttle body and requires a extra squirt of transient fuel to overcome the sudden lean condition.