I have a 78 chevy pickup that I have done an 89 tpi conversion on. 355 10.5:1 comp with factory tpi iron heads, lunati voodoo cam, modified 24 lb injectors from ls1 (28lb at 60 psi), long tubes, factory intake and tb, no vss, no tcc, 700r4 trans w/ 2200 stall, running moates chip adapter with tp v5 running 165 ecm with $6e mask. innovate lc-1 wideband with simulated o2 going to computer and wideband gauge installed in dash

I have been tuning on this truck off and on for a year trying to dial it in and have had alot of success, but still have a few hiccups to iron out. My question is, I have a rich decel issue that is plaguing me. My blms from tables 1-3 are spot on 126-130 during cruise and light throttle but during decel from cruise my blms drop to 108 and wb indicates 12-13:1 afr causing my next acceleration to begin lean 16.5-17:1 afr because of the stored low blms. I have tried messing with the dfco and decel enleanment settings but still seem to have the rich decel. Is my lack of a vss causing this problem or do I need to keep working with the decel enleanment and dfco settings to correct the problem. Its a cruiser and doesnt really get driven aggressively enough for the dfco to kick in much (usually no higher rpm decels) except maybe slowing from highway speed but haven't seen much reaction from changes in decel enleanment settings

 

uploaded a tp v5 datalog file. watch blms go to 108 during decel then jump back to normal a sec or two after getting back on the throttle

scratch that, wont let me upload a .xdl file