Hello guys I have a Chevy c1500 5.7 vortec and I’m having a missfire problem (p0300) that just started out of no were and I started with changing the spark plugs (ac delco), distributor cap and rotor, and wires and then I cleared the codes with my scanner and it pop back up with the same p0300 code again so then I replaced the spider injectors cleared the code and again the same code pop up again so now I’m stuck and don’t know what it could be. Does anyone have any ideas.