Backing firing from 2500 rpm up
I have a problem that I cannot seem to figure out, my mustang backfires from 2000 rpm on up. When started cold it will idle fairly smooth with occasional backfire if you thump the gas the car just shuts off. Once warm it runs smooth until about 2000 rpm and then it is like someone kicked on a rev limiter. It will climb in power while backfiring bad then seems like two to three cylinders die then come back on. When cruising down the road at operating temperature I have had the car just turn off. I try to restart and it cranks like there is no gas, I wait about 30 45 minutes go back out and it will start fine like it never happened before. This is driving me crazy here are the stats if anyone could help.
GT40 intake upper lower
BBK 65 mm throttle body
Pro M 75 Maf for 19lb injectors
Equal length shorty 1 5/8
H-Pipe, dumps before axle
Black magic flex fan
16 degrees timing runs even worse around 12 like too rich
130 Amp alternator
Cap Rotor wires plugs found the old one somewhat melted some how
Fuel Filter still running the stock fuel pump
Fuel pressure gauge on fuel rail reads 35 psi off and 32 psi when running jumps to 40 psi then back to 32 psi when revving motor.