1996 Ford F-350 Questions

Unanswered 1996 Ford F-350 Questions

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My cat convertor lasted 10K and turned blue also. I have replaced EVERYTHING several times over (8 manifolds, two cat convertors, o2 sensors, egr valve, etc.) Even replaced the motor with a low mileage used one,11,0...
running on 7 cyl,s I changed that fuel inj.and is still smoking and running rough.when i unplug that inj.it stops smoking.what could be the problem?
The ticking gets faster when I accelerate. But It doesnt do it if it's not in gear.
I also checked all the fuses in the dash, and under the hood.