help! won't go nowhere

[fabdf350]

i have an 03 6.0 w/ 121,000miles. and my problem is..... my frame rail fuel pump was going bad around a month ago, or so i think. because it was starving and sputtering for fuel beyond 1/3 throttle. but i kept driving it because its my only vehicle and low funds. and then one day it took me 30 mins to go 1 mile to get home. it did not want to run or start. so i replaced the frame fuel pump. and now it at least starts, but sputters like its 2 or 3 bad injectors. except if i let fuel pressure build up while it is off. and then start it and put it in gear, it runs somewhat decent for a 100ft and then no power whatsoever. i have to put it in neutral and rev up a bit and gear drop it to make it back. (i know i hate doing that). i tried to make the 20 mile trip to the dealer so they can scan it, etc. but i barely made it out of my block. so i returned, i definately dont want to pay $600 to one of these "helpful towers." so idk what to do. oil pressure guage seems to be a lil slightly higher than normal. and my heads are going bad, but i dont think thats the issue. any input is appreciated thanks!!

[Hawkerhino]

sounds like some of the work trucks we have that have dropped injectors and/or the oil pump. is it puffing grey smoke?

[fabdf350]

only at startup sometimes. its usually white. and when it runs it doesn't show soot either

[Tyler]

Originally Posted by fabdf350

only at startup sometimes. its usually white. and when it runs it doesn't show soot either

You still coulda dropped some squirters. When was the last time you changed fuel filters? Oil?

[fabdf350]

i had changed the oil and filters 2k ago. and just replaced the frame mounted fuel pump. so that filter is brand new also. and the oil looks, smells, and feels normal. im going to test the oil and fuel tonight.

[Tyler]

Check for smoke at idle. Looks very hard, it could be very faint.