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Hey guys I need some help. I have a 67 with a 302 roller .40 over and Iam running a procomp distributor and a Holley 670 street avenger. When the car is in park it runs fine. When I drive about a half mile it will begin to backfire and lose power. I have already swapped the wires and plugs. It ran good for about a half mile then during acceleration it backfires and loses power. Any suggestions?
