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Help needed ASAP. 99 4.8 in 94 c1500

I had the computer flashed and it will start and idle. However when I attempt to press the gas pedal it revs up a couple 100 RPM then falls flat on its face. I can unplug the throttle position sensor (brand new) and same thing happens. It's almost if the ECU isnt communicating with sensors to...
- Wiregrass mechanic
- Thread
- May 19, 2020
- Replies: 36
- Forum: Engine Performance + Maintenance
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4.8L Vortec decent idle but NO power

Quick backstory: Customer Swapped 4.8 vortec to replace 4.3L in a 94 C1500. Brought to me in pieces. Computer has been flashed all unnecessary stuff removed (including theft) When you attempt to push throttle no matter if under load or not. Motor does not rev very well and sputters and cuts...
- Wiregrass mechanic
- Thread
- May 12, 2020
- Replies: 5
- Forum: 96+ Vortec Performance + Computer Swaps
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4.8L Vortec in a 94 C1500 wiring question

I was hired to complete a project for a customer. The owner has a 94 1500 manual with a blown. They had a "friend" with a 99GMC c1500 with 4.8L. He swapped the motor, changed the flywheel, and could not get it to work. I was looking to see if anyone had a quick guide of wires to save me some...
- Wiregrass mechanic
- Thread
- Apr 3, 2020
- Replies: 7
- Forum: 96+ Vortec Performance + Computer Swaps