On my 2018 l83 swap I have big negative timing issues.
It seems to drive good until it shifts.
After each shift at part throttle it starts commanding as much as -20 degrees of timing and I can hardly accelerate.
I can't seem to figure out what is causing this to happen.
If I pull the MAF connector and reconnect after about 10 seconds the engine runs noticeable different.
After doing this it is running much better and it is not commanding the negative timing anymore.
What am I missing.
Stock engine with open air intake.
I have tried MAF tuning but with no success.