Please Help? At this point I don't know what to do.
I have a 96 suburban with the 5.7 vortec. Been misfiring for about 7 months. In the time I've been throwing money at it left and right. Replaced the fuel injector, fuel pump, fuel filter, spark plugs (yes they're gapped), coils, throttle position sensor, all 4 02 sensors, upper intake manifold and all upper gaskets and o rings. Truck starts but high revs to 3,000rmps and then shuts off unless I continuously give it gas.


