engine swap problems

[BIG_RED]

Injector stuck open would be my first guess, but since you replaced those.. Did you test compression yet? missfiring low compression cylinder would do that. Although it'd have to be just a little low on compression if it cleans up at higher rpms. Are you sure the new ip is good?

 

[beanman1]

it was the injection pump off of my other engine it was rebuilt a month before the rod bearing spun

 

[BIG_RED]

Valve stuck open? Sorry friend, I'm pretty much stumped.