My set up is in my sig, I'm having a little problem while running the car hard at an auto-x. When I am in 2nd gear running at full throttle almost to the redline then let off the gas quickly to start braking for a slalom or whenever I try to "Feather" the throttle through the slalom, the car starts jerking violently until I hit the gas again. Any idea what might cause this? It only happens when I run way up in 2nd gear and come off the throttle very quickly. My AFR is around 11 or so at this RPM. I have calibrated the TPS several times and loosened the throttle cable slightly, neither helped. Any help is much appreciated!

 

fuel cut on decel kicking in?

 

I'll check the decel table this afternoon, do you think that might be the cause? The tuning still isn't perfect, but more than good enough for any driving. It's not a huge deal, it just gets kind of annoying when autocrossing.

 

could be the TPS value in the overrun settings and simply accel enrichments as well.