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So i am doing a swap in a 88 c1500 with a 5.3 out of a 2002 Tahoe drive by wire. The guy I bought it from gave me a stand alone harness. I have changed out the intake for one off of a LS1 with a cable driven throttle body. Will my harness still work or do I need to get one for a cable drive throttle body?
Depends on what the harness is set up for...
That harness will not work. Why not try something like the holley hp EFI? By the time you buy a harness, computer, tuning software, and wideband(holley has one built it) it's more expensive than buying the holley setup. Plus the Holley has features to tune itself, 1 timing table, changes can be made while it's running, no stopping and turning the truck off 100 times to re flash the pcm. heck of a lot simpler to tune.
Or just get the correct TB and pedal assembly?