After warm up engine runs ruff and loss of power

try rebuilding the carb nd or tune up on engine

Have you done a compression test yet ? Does it have normal oil pressure now ?

Sounds like one or two of the many sensors may have failed,. Like everyone else said... scan it...good luck.

tune up,air filter.

could be a stuck egr valve

black smoke sign fuel too rich , stuck egr will make it hard to start, check reprogramming was done correctly or O2 sensor operating

these engines are pron to injector failure !!! white smoke means dumping fuel ! black smoke means lack of air ! blue means burning oil! its not an easy task! by all means not cheap! ull need 7 injectors and one #8 injector call a ford dealer to see the price ! but i would also call an international aka navistar dealer! there sometimes cheaper

I had a similar issue to this after I got in a VERY small fender bender (literally) in an 87 Turbo Supra. In my case, my pasenger fender got pushed in JUST enough to crack a charge pipe and cause a boost leak.

Basically, what was happening was the turbo would spool and build boost, the mass fair flow sensor would read all this air coming in and tell the ECU to dial up the the appropriate amount of fuel. When the air reached the cracks in the charge pipe, it would escape out of them. Thus there was a much lower air-to-fuel ratio, causing less fuel to combust, which lead to power loss and black smoke out of the exhaust.

My guess is either an oxygen sensor, or more likely a boost leak.

Good luck mate.

black smoke is an indicator of too much fuel not burning in the combustion chamber, or too much carbon build up in the exhaust. you might have an injector problem, i.e. 2 much gas overloading somewhere.

If you let it warm up first it should not run ruff .Its the car staying in low gear to warm up the catalytic converter faster so that it can cut the amount of pollution that the is car producing .For the clean-air laws.