while driving rpm's drop engine stumbles then dies, 1992 Mustang 5.0
1992 5.0L, trick flow cyl heads, 1.6 roller rockers, 70mm t.b and egr.
under drive pulleys, upper and lower street heat trick flow and automatic tranny,bassani shorty headers,
now for my problem is the car starts off fine, once it warms up and driving the rpms drop to about 500 ,backfires, it feels like the transmission is about to fall off the car then it dies.
have to wait like 15-20 minutes before it will run, then it repeats it all over again, with the waiting, then it starts.
do i have a bad tps or byb valve, could i get a little help, im highly stress, every one i know is just carb and just are no help to me but telling that i can not fix it.