Question about 1999 Chevrolet Silverado 1500

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I have a 93 chevy 1500 4x4 5.7. What will make it miss realy bad and spark knock? I have changed the cap, rotoe, coil, plugs, fuel filter, collant temp sensor and timed it and it still does it..

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Do you check the egr valve or the selenoid ........ look with the engine runing pull the trotle cable to rev the engine check the diagram from the egr valve is going to move at all times and the engine is going to missfire ........ then desconect the little hose from the egr selenoid rev the engine 2000 rpm you will see the diference

Posted on Dec 29, 2010

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