LT1-LT4 Modifications 1993-97 Gen II Small Block V8

help needed

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Old 10-18-2006, 07:35 AM
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ok i need a little help
I have a 95 Z28 A4 and i'm getting the code for EST ground (42). The car shakes at mid to higher rpms (above 2k) and backfires. what are all the things i should check to solve the problem.
i've changed plugs, opti, plug wires,fuel filter, and the fuel pressure is good.
The ICM and the Coil also checked out to be good.
any ideas would be great

Thank you
Anthony Bowers

Last edited by knight17Z; 10-18-2006 at 09:16 AM.
Old 10-18-2006, 10:36 AM
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Backfire or a pop? If it backfires, its a timing issue. If its a popping, could have an exhaust leak.
Old 10-18-2006, 10:37 AM
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it's a backfire




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