hello, I have a 95 tahoe, 5.7 v8. 115k on the clock. out of nowhere....the engine misses and during pressing on the gas pedal the engine losses power and begins to die. I have changed plugs, fuel filter, wires, cap and rotor, coil. I have checked everything. fuel pressure is 14 psi even when the problem starts. I also swapped the MAP sensor out. Also the local dealership told me that the ECM was bad. Bought the part at napa and installed myself. Still nothing. Any ideas?????

90% sure egr valve needs to be changed