1990 GMC C1500 ignition

1990 GMC C1500
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TRUCK475
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Electrical problem
1990 GMC C1500 V8 Four Wheel Drive Automatic

I put a 350 small block Tbi engine in my truck,The owner before me had a 350 carberated engine he installed than blew up,he cut all the senser plugs off the harness,I wired them back in.The truck starts and runs great but when I shut the ignition off the truck still runs like nothing happened,what am I missing?
Feb 14, 2009 at 4:03 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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