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Actually evything I replaced needed replacing but I will get the manual. Also would you recommend having them cleaned or just replace them.

Stutter Thx will do.

I have a 91 vette and I'm having a idle problem has a slight stutter and it's a little worse if its in gear. Also if I'm driving it say I go up to about 90 and let off the gas it will backfire. I have changed plugs wires dis cap rotor egr valve still does it. I have a new oxygen sensor I'm...