My 2014 Silverado 1500 LT is throwing p0307 codes. I replaced all plugs, wires and coils, my pcv valve, 2 lifters and still throws the code. It says my fuel is too rich and when I accelerate from a red light the blue smoke is so thick you can't see the car behind me. With a strong fuel smell. Smoke only from the left exhaust pipe. ( I'm running straights, co catalytic converters.