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For a slightly tuned up motor, your symptoms sound pretty much normal. However, since you noted decreased power, increased fuel consumption, and increased smoke at times, check for intake and exhaust restriction. Banged up exhaust, plugged air filter, etc. If nothing is found there, see if your fuel pump adjustment seems to be in the same place as the last time you looked.
If you have an injector crapping out, you may have to wait until it gets worse before you can isolate while the truck isn't moving.
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1993 F350 IDI Turbo
4x4 ZF Crew Cab Longbox
BIG SLOW LOUD STINKY
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