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1997 Chevrolet Silverado 5.7 vortec misfire installed new fuel injecti

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I installed the upgrade fuel injection spider in my truck. I did full tune up cap rotor plugs wires etc. And plenum vacuum sensor. I pulled and cleand the egr valve.I ordered a knock sensor will be in tomorrow. I still have the same misfire from 1500rpm til like 2200rpm.I guess I'm going to change all the o2 sensors. Also the cats and cam gear. Anthing else ? Thanks for your help..if anyone can.

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