ok, we went through and cleaned all the injectors, checked all grounds, new mass airflow sensor, throttle position sensor, air charge sensor, temp. sensor, antifreeze, has no EGR, aftermarket headers, replaced all intake gaskets, polonium gaskets, getting right current off all sensors off sensor part, and PCM, IAC is bad, only misses when it gets hot. this is a 5.0HO 95 mercury cougar motor put into a 93 mustang LX convertable

PLEASE HELP been stuck on this BS for forever now

 

Did you say your IAC is bad?Check that ...Or could be your tfi module

 

wait.. whats a tfi, im old and not good with the whole abbreviation thing

 

do a koeo/koer test on it to see what codes show up

 

The tfi module is the grey thing mounted on the front of the distributor. Common problem with them is missing or complelty dieing when they get hot. This is the reason why it was relocated to the fenderwell in 94.

 

+1 - had the same thoughts.

Could also be 1)bad coil, 2)bad plugs, 3)bad wires

 

brand new plugs and wires and cap

 

already did the test, all it says is EGR not hooked up, and i have tht taken off

 

how bad is the misfire after it warms up??

 

Still like I said......Most likely your TFI Module....