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09-20-2011, 08:35 PM
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95 chevy z71 spitting and shaking at 70mph
I have a 95 Chevy z71 350 and a couple of months ago on the highway it started shaking real violently at 70mph, and kinda bogs down and wont go any faster. If I let it coast for awhile it will go away and i can climb back up to 69mph. If i put my foot in it it will spit out the tail pipe.
Parts iv'e changed: Fuel pump and filter EGR valve I don't have catalytic converters so i know there not clogged. I thought fuel but I don't know its got me buffaloed Any help would be greatly appreciated i just don't wanna keep throwing parts at it. Thanks 
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09-22-2011, 10:36 AM
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hmm.. maybe its a spark issue?? hard to tell without seeing. is that an efi engine or tbi?
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09-22-2011, 01:29 PM
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My friends truck had this problem but not as bad. He has a '94 GMC Sierra and all we did was change his plug wires and it fixed the problem right away. But that's just my guess is the wires.
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09-22-2011, 04:01 PM
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camaro820- its a tbi motor
bravelil305-the spark plugs and wires are not that old but i will check someone also told ecm so i will be checking this weekend thank you for the advice
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