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1990 chevy silverado tbi(I have a problem) help please?
kinda sounds like a problem i had on my 87 tbi truck. Ended up being a broken knock sensor wire. Have you changed the starter recently? Lots of times the wire get unplugged of broken when taking the starter out.
Should be on the pass. side of the block towards the bottom. Mine had 1 wire going to it and if i recall correctly the wire was blue.