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2007 gmc 1500 4.3l total loss of power.

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2007 GMC 1500 4.3l. Check engine light is flashing. Changed both 02 sensors pre cat. Changed cam sensor. Changed plugs, wires, distributor cap, and rotor button. Truck ran great for about one minute. Then it went back to engine light flashing along with it missing backfiring and almost complete loss of power. It is near impossible to get over 30mph any suggestions

Edited by Scuba4185
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