I have a 93 Ford F150. 202,000 miles on 5.0L. Sometimes it will not start after it is shut off. 1 hour later it might start and it might not. First thing in the morning it fires right up every time. I have checked for vacuum leaks, I have replaced intake air temperature sensor, temp sensor, o2 sensor, MAP sensor and IAC. I am out of ideas. Thanks for any help!