1998 GMC Jimmy Questions

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My 1998 gmc jimmy started over heating then died and lost all power from the accelerator then when I had it pulled over it started billowing White smoke and now the serpentine belt will rotate but will not turn over does anyone have an idea what went wrong
Code reader saying code P0442
Some instrumwnt panel lights not working i replaced the pc 194 bulbs all the small bulbs are working and i checked all exterior maker lights
The loud noise is coming from rear 4x4 push button lights arent light on 2hi 4lo or 4hi and when i put it in gear still holding in brake my mph goes up not high but like 5 or 6. Not sure of the issue just happened wasnt like that when i got out got back in and wouldnt start got a jump and all of this
Replaced the master cylinder thinkin that was it and the brake light went off but the abs wont...abs control module maybe?
This works sometimes but at other times, I hit the biggest bump I can and it doesn't start blowing. The air is cold enough when it does blow. Doesn't always blow hard when it blows but much better than not working, at least in the front seat
ran fine went into a store and will not start now, I'm at a loss done this kind of work for 30 now after my stroke I lost a lot
I already check bulbs and are good I switch the brake light switch and turn signal switch and still doesn't work.
My 98 engine overheated and I tried to save it. I have a 2000 jimmy 4x4 engine that looks almost the same but will it fit in my 98?
My car was knocking so i found a rocker arm loose on cylinder 6. The nut was tight to spec, i tried tightening to and did not change anything. I put a washer between rocker ball and rocker nut and tighten to and it worked, i could still move rocker arm from side to side slightly. Now it runs really rough and gives me code P0306. What should i check for. Thank You for ur time.
When at a stoplight

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