Never unheated, but I have a frybrid kit installed.

The engine is really struggling on diesel. I'm not switching over to grease anymore, but after a 10 miles or so, the car basically can't pull the fuel through.

The mechanic is...well... a mechanic... I just didn't have time to fix it myself... now I do.

I dunno, maybe I'll get lucky and not have to replace the IP, but reading up on other people's posts, I'm pretty sure thats what it is.

On a totally unrelated symptom, I have oil coming out of my intake.... I forgot to tighten the oil cap down a few months ago and drove the car for a few miles with it off... needless to say there was oil everywhere. Now I have oil coming out of my intake hose....