Need some help with correcting an issue with the engine stumbling/hesitation coming off idle. Trying to gentle pull away from a dead stop, the engine stumbles 2 to 4 times before driving away normally. If I somewhat aggressively try to accelerate from a stop, there's generally no issue. My tuner (WS6Green on here?) has been trying to figure it out as well. The car has a few thousand miles on it, no other issues than the stumble.
5.3 Gen IV / E38 ECM
243 heads with upgraded valve springs
AFM/VVT delete
Mild Texas Speed cam (truck cam I think?)
Mid-length headers (Church Boys)
Trailblazer SS intake and injectors
Gold blade throttle body
Card style (LS7?) MAF
Corvette fuel filter (returnless)
4L60 transmission
Built locally
Slightly higher stall converter
LC-2 wideband
I've posted the tune and a quick log from tonight. At the 1:53s mark, you can see the RPMs jumping while car is in gear and light throttle (holding foot brake).
I can see in the log the engine goes lean with the injector pulsewidth dropping. However, I the exhaust smell is strong (no cats). I'm assuming it's going lean enough the engine stops igniting the fuel?
Lastly, if I need to log different channels...let me know which ones.
Thanks!