ok i changed my spark plugs a a week ago and the reason i did that was the car was backfiring and was nt running right, now i get new plugs and it wouldnt start with the gap at 0.050 i went online and got info that said it was 0.035, now it starts but its running rough like it backfires when accelerating and when i let off on the gas sometimes, im not all experienced with cars but ive learned alot in the past few years.
More than likely you need a new OptiSpark distributor. The Opti going out is a common problem on LT1's. The Opti is located behind, and below the water pump. A common reason for failure is when the water pump goes out, it leaks on top of the Opti, so it's best to replace both at the same time. Count on a full afternoons work, and about $600 including gaskets and antifreeze etc.
Gary
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