ok the ops went out we rig it up with a hot wire it ran for a while like that then i bought an ops and it lost its prime we got it running and it ran good had about 500miles on it and last night it started smoking really bad kinda white and blueish and running like it needed a new fuel filter then all the sudden it lost all low end power would not run until it got to 2000rpms i was limping it home then it it really lost power wouldn't go above 2000rpm sounded like there was sum thing blocking the exhaust i pulled into a buddys house it lost all oil pressure i check the dipstick it was full then it died i changed fuel filter and it ran for thirty seconds then died i came back this morning and it started then died tried again then nothing there was oil coming from the back of pan between motor and trans a good steady drip i opened the t valve to drain the air in the fuel and nothing came out when it was running however when i fixed it back no fuel would come out ether so i dont think that matters its a 92 3500hd 5 speed hope yall have some ideas cause im stumped sum times it will start but you have to keep on the throttle or it dies but not enough power to pull itself no codes either

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anybody ?