mavrick

I got 96 chevy c2500 pickup, 5.7 vortec, engine light is on, it is giving the codes P0155, P0174 and P0300 which is a misfire, so How do i fine the misfire source and could the misfire causing the other codes to appear which is o2 heater circuit bank 2 sensor 1 and fuel system too lean bank 2, and as far the truck it drives good and it starts right away but some times when it is cold it gives some knoking then it goes away when it warm up and the engine is little rough,
please any help would be appraiciated I need to smog it by the end of this month

LARIDERS

I am not sure how many miles you have or what has been done to the truck. But if it where me I would do a tune up. plugs,wires,rotor, and cap. then I would replace the o2 sensor's. I know there not cheap. but in the long run you might get some of your money back in gas.

s34n

x2. check spark plug wires from cylinder to cap/rotor as well.