i just did a dual port to multi port fuel injector swap on my friends 89 ef auto. however when i started the car, it idles fine, but is boggs when i WOT it quickly. i recheck the wiring to see if anything was abnormal. also there is no codes...i tried swapping injectors, fuel pressure regulator, injector resistor box, MAP sensor, swapping computers, swapping distributors, and even swapped the TPS off an EG...and the car still boggs at WOT!! i even check timing and thats die on...so if anyone can help me fix my friend car that would be greatly appreciated...TIA

thank you
fadman