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...
I just replaced plugs, wires, cap and roter. I readjusted the wire routing. Still rough running and misfiring
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?
Rust in fuel system. Will not start. Changed both fuel filters.
I haven't driven the truck often. When I parked it, it was fine but water in tank light was on. The filters were changed. The tanks were cleaned out and fuel pumps changed. Batteries (2) are new. Could it be the fuel ...
fuse 9 is pcm, pcm power relay, inj pressure reg, inj driver module. with fuse out i can wiggle wires to pcm block and have current.
my truck is running hot at lower rpm. when i accelerate it gets colder and will run on thermostat temp until it shifts to lower rpm. i hear a clincking pulsing noise in top radiator hose almost as if it is a pressure ...
as i accelerate my temp comes down. running hotter then should but never overheats or boils over. replaced waterpump, radiator, tstat. Can this be a partially plugged cat. check engine light comes on then goes off aft...
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.
When I start the truck it doesn't want to start. It doesn't want to change gears either. It's like it doesnt' have any power.
I need to get a quote on replacing the distributor gear which is notorious for failing in these 5.8 ford engines and quote on timing chain replacement? Ialso do not see a quote on engine rebuilding .
after unit does start, starts and runs fine. when it doesnt start, cranking on and off for long periods (sometimes with jumpering from another truck) it will splutter and start. Sometimes comming back 4-5 hours later ...