Why wont my car start?

Did it possibly get flooded with fuel? Hold foot to floor while cranking, it will shut off injectors and allow more air into the intake. (If flooded, once it tries to kick over, let off key then release gas pedal, hit key again without using gas pedal)

Thanks but that didn't work it's gotta be something simple but out of sight out of mind right

How about cleaning iacv?

You said you replaced the head gasket....did you happen to miss plugging in the sensor on the air boot from air filter to intake?

No I got that but what's the iacv?

Idle air control valve, it helps to determine how much much gas to add to the amount of air coming in to keep the right fuel/air mixture

Check the cam timing.

Check the cam and crank sensors too. If starts and has very poor power indeed check cam timing as the t-belt may have been installed one tooth off! A dirty throttle or bad ACV usually doesn't prevent at least SOME amount of rough starting. Same with MAF sensor on intake plenum....

Replaced cam and crank still nothing air control valve is good it could be the timing