Put a 05 5.3l into a 84 2door caprice. Bought a harness and a computer from PSI. The computer was programmed. Motor just turns an will not start. Changed plugs an seems like gas is on plugs when I remove them. Checked spark plugs for spark. Checked injector wires with noid light. Any help appreciated.

 

you may have better luck over at ls1tech, lots more computer/tuner guys over there. you said you checked those things, but you didn't say what you found. got spark? got power going to all the injectors? any check engine light on?