I have a 91 Notchback, originally a 4cyl, converted with an 89 5.0 HO motor and a tremec tranny. The problem is that i thought my fuel pump took a ****, (i still have EFI in the car with the in tank pump) and just to make sure it was the pump that went, i tested the wires that run in the trunk and down into the tank and i had no power to any of the wires. So i bought all new relays and everything, replaced the one under the drivers side seat, and the one above the ECM. I thought sweet, now she will work, ......no good, still now power. So i got pissed and just wired the fuel pump to a switch and now the fuel pump worked....problem solved. Not really, for some reason i can figure out, the car runs normal under 3500 rpms, once i go over that it completely breaks up, the tach goes wild, and it just goes duh duh...duh duh.....duh, and wants to stall out. But it clears up then and goes back to idle normal again. I know when i get over 3500 rpms, it just like dumps the fuel cause it starts flooding it out cause the plugs are wet then and it starts to smoke out of the tailpipes, but then goes away when it goes back to idle. I dont know what to do, i replaced the d.cap, coil, plugs, wires, i put in a new TFI module, and even took the ECM out of my buddies car and stuck it in mine to see if it was the computer and it still did the same thing. i dont know what to do now....and im pissed cause my car is just sitting there. Any help would be greatly appreciated! thanks!