2003 Trailblazer 4.2l rotates but does not start.

I have code light that came on but don't have tester with me. I will have to get it in morning. I got the sensor for $20 going to try that thank you though

I put crank shaft sensor on tried to start it but but only rotates still dont turn over. I pulled plug and there is fuel in there, so I know there is fuel getting to it, fuel pump comes on when I turn key. Pulled injectors off to see if they were clogged they are fine and I put fuel pressure tester on line and it is fine. Just stumped little I will figure it out but going through it now.I put test light on middle wire engine coils and hooked to battery and coils are working also put meter on pink cable on coil and it is reading fine on all of them. All coil boots are fine but one but that shouldnt make it not start. New plugs and gaps are good and have spark in all of them. New cam shaft sensor, new timing chain head has been rebuilt, took off pulley tensioner and belt to see if that was a reason still nothing. I also installed a new exhaust actuator sprocket and sensor