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Plug not firing replaced it, checked all fuel lines, bypassed fuel purge valve and fuel canister. No oil in water or water in oil so head not cracked. Could it be a burnt valve or the valve seat.
I am having this same problem. I found out today that it is a burnt valve on my number four. Start the car and take the number four plug wire off at the coil pack if nothing changes then it's not getting fire. Also crank car an go to the tail pipe, take a dollar bill and put it in front of tailpipe if it sucks back to the tailpipe then you have a burnt valve. If it is not this check your injector for clog on that cylinder causing a misfire.
Check your ignition control module. Most of the time it is located on the driver side between the strut and the fuse relay box. When you turn your key on it gives power to everything including starter all the way to your crankshaft sensor.