ok i hav a 77 280 that now has a 82zxt motor in it. it starts and idles fine, ill get going and it sputters and i don't have a lot of power. but at the same time I'm building boost pressure? sometimes the car runs awesome thought....? seems to run good when it is ran down the road 15 miles or so. shut it off and turn it back on and it runs bad agin. any help would be greatly appreciated. Thanks!

 

check all connections and fuel pump pressure.

 

im pretty sure i figured it out. its the ecu. but thanks for the reply!