Truck runs poor

10

Asked by Aug 31, 2016 at 05:23 PM about the 2000 Chevrolet Silverado 1500 LS Long Bed 4WD

Question type: Maintenance & Repair

Several issues but right now, bought a spark check tool at auto zone. All coils
showed orange spark instead of the optimum blueish white. Replaced all 8
coil packs. still runs poor, checked #1 cylinder and still showing orange spark.
Is that the ecm not giving enough juice?

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