When do the engine RPMs bounce when driving?
When do the engine RPMs bounce when driving? It seems to happen primarily when traveling between 45-55mph. When driving, slightly accerating, the truck is doing about 1100 rpm in its 6th gear. The engines RPMs seem to bounce back and forth 50-100 rpm. It is not the usual 'bounce' you get from v4 to v8 mode, it is happening while accelerating which i can see is keeping it in v8 mode. Why is it when driving the RPM gauge drops or jumps up? Somewhere the fuel drop then suddenly rpm decrease better check the complete fuel system from tank to...