Pulled my transmission to put a new slave cylinder in, figured I'd do the lightweight flywheel mod & lightweight crank pulley mod- dropped 20lbs off the crankshaft. Car has every bolt-on mod, no cats, 60mm throttle body. It had someone's tune in it when I bought it..
So, after I put the transmission all back in, now its doing this hard hesitation when it comes up on boost, like ya hit the brakes. Comes back on strong if you pedal it. Its not overboosting. I'm certain its in the tune/ECU limit. I cant figure out what its mad about though. Its worse in 1st than 2nd, & not always happening in 3rd, sometimes in 4th, hardly ever in 5th & 6th. Feels TQ related. No CEL. I've seen guys post about it being a fuel line issue in other forums, but its had the fuel line mod done as well (by a local shop). Anyone help? I've tried modifying random things in the tune to no avail. Reloaded the as-bought tune in it.