Im stumped

[bauer]

Ok so a buddy of mine has a 2000 cclb 7.3 and he had like 200 sum odd thousand on it and needed a rebuild so he put a motor with like 90k on it n instead. if he leaves the truck sit for more than a day in the cold it will not start unless plugged in. he has the same sort of problem in warm weather but not quite as bad..he took it to a shop and they claim low compression? Well i wouldnt think that a motor with that low of miles would have compression issues? I told him possibly changing his gp relay to the stancor would help? Any ideas?

[Dixienormous]

mine did something similar, i live in FL went to CO for the winter and had a problem starting in the cold had to plug it in all the time then came back to FL and still had a problem starting even wen it was warm out side i had to have it plugged in all the time so i replaced my injectors and problem solved.maybe something similar?