89Bronco58
New member
ok i have an 89 bronco that had an efi 302 and that blew up so i put an efi 351 in it...i changed the computer from another bronco that had a 351....is there more than 1 type of 351 computer??? cuz now it feels like its running rough and missin but it has new plugs and such...i put the 302 computer back in and it seemed to have more power and acceleration but it still lacks power....cuz the 302 moved the truck better than this 351 does...the motor has been sitting for a long time so i was thinking maybe it just needs to be cleaned out and ran for a bit???? ....anyone??? The truck has an automatic overdrive transmission (AOD) and i ecu came from a truck with a c-6 i believe and yes i used the 302 wirinf harness.....the truck idles smooth and around 2 grand it feels like its breaking up and hessitating...it comes in and out of power..i did not tebuild the motor just freshed all the gaskets....the motor ran good and strong in the bronco itook it out of and it only sat for 2 months before i dropped it in my truck......when i was testing the spark i noticed when i pulled the coil wire odd and cranked the engine the spark jumped all over the coil...from the metal *** back all over the plastic so i thought that was a bad sign..i stated the truck and soaked all the wires and coil with water and nothing arched out....i was thinking maybe my exhUST it too restrictive on the one side cuz it isnt lined up str8 and the donut gasket is in there crooked...so if the exhaust pipe was alot smaller that usual ...like being clogged....would that make it hessitate like that????...damn thing really has power like a 4 cylinder...and i dont think the timings off because if it was too retarted it would just smoothly accelerate slow but it doesnt it accelerates rough.......anyone help??!!!