truck not running well..

[Prerunner1982]

ok... i had planned on working on the exhaust today to finally fix the collectors.. i needed to run some errands this morning, when i got in the truck and took off it couldnt get out of its own way. In park, it runs smooth and fine, in drive it stumbles and cant get up to speed. when i try to give it gas it just stumbles worse. I got it back home and cleaned up the carb a bit and tried it again. same result, on the way home it finally opened up a bit but it is still stubbling. The plugs and wires seem fine, i am going to go clean the engine off later as it does have an oil leak. Any ideas? I have only had the new Q-jet on there for a year. time for rebuild already???? any ideas??