Recently rebuilt the top end of my 1995 3.8 v6 Mustang. The heads were machined, new lifters, new pushrods, all new gaskets, etc. everything was torqued down to the correct specs and patterns and of course new head bolts were used. It turns over and has fire but will not start it just kinda sits their and burps acting like it is going to start but doesnt. The crank sensor was checked and replaced, the cam sensor was checked and replaced, and the ICM (ignition control module) was checked and passed, and i also replaced the old spark plugs and put new autolite plugs in it. I am out of ideas and and need help. It has fuel, spark, and air and everything i could possibly think of has been checked or replaced. If you have any ideas please feel free to share them. Thanks!!