Timing chain Lose ? Altenator bad ? Disconect for a this and see if the problem goes away. Ciol arc ing insidide of its own case? Coil wire acring ? TSB about that on all 4.3 any plug wire arcing cap and rotor . less than delco cast less and have troble. injector plug go back on after good its easyer to bend a pin down than to get it right
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