Gadgetized

iTrader: (9)

That's why your mileage is so bad, you aren't moving!
Just kidding. Hopefully you find the issue soon.

AndysC3

iTrader: (14)

was the pcm retuned for the 5.3?

Heavrolet98

iTrader: (1)

I honestly don't know. The kid I bought it from was a idiot and did a half *** job on everything. I can't tell you how many bolts were missing and wires cut or unplugged. The tranny wasn't even bolted down when I got it so I would guess he didn't have the smarts to get the computer retuned.

AndysC3

iTrader: (14)

I would start with that. Need to adjust for the different displacement.

Heavrolet98

iTrader: (1)

Alright I swapped the position 1 sensors side to side and my crazy fuel trim followed with the sensor from bank 1 to bank 2 so I know for sure my sensor is bad. I can't find any vacuum leaks. The intake is all tight with no leaks. Can someone give me some info on the diy 4" intake tube I keep seeing mentioned? I guess I'll get a sensor and order a tune on Friday and see what that does for me.

AndysC3

iTrader: (14)

a 4" 90* bend, some aluminum pipe, and a 4" to 3.5" reducer to the maf

Heavrolet98

iTrader: (1)

Im guessing I can pick these few items up at home depot?

oakley6575

iTrader: (5)

Not to thread jack, but isnt the 4" intake restricted by the smaller MAF?

gagliano7

Make sure the computer is matched to the wiring harness.Thet didn't make them all the same.

slow67

iTrader: (2)

If the speedo is moving with engine RPM when your not moving, sounds like maybe they have the Input speed sensor and the Vehicle speed sensor swapped.