My 3500 UIM install(finally!)

[IsaacHayes]

EFI connection should have the MAP pigtail as well for cheaper than GM. Just get the LS1 since they use the exact same MAP.

My injector harness comes out between the UIM and LIM near the rear by the ICM/Coils. So I didn't have that issue.

[SE'sarecool2]

Update:
I tested the fuel pressure and its OK- no leaks
I think the trans is slipping

[IsaacHayes]

Hmm. And you're sure the injectors are not clogged or leaky? Possibly you could have weak spark too from a CPS or ICM going south..

[SE'sarecool2]

Nah, I'm pretty sure it's the trans... I put two bottles of fuel injector cleaner in the tank a week ago and it still does the same thing... but not when the motor(& tranny fluid) are cold... it's time to change the fluid anyway(34K on Mobil 1 synthetic ATF). Might try Royal Purple synthetic ATF this time. Hopeful that the TCC isn't shot.