2003 Buick Regal Questions

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does not accelerate to pick up speed or going uphill
rolling down the road, engine will shut off,,start right up,, misses when power is applied. idles fine, but will shut down after a minute, not overheating.
2003 Buick Regal
Symptoms include:
-started studdering in idle at long lights last week
-2 days ago, lost get up and go at acceleration, studdered, and not able to get above 30mph.
-was told its misfiring, changed spark plugs. Timing is off slightly
-overheated, wouldn't turn over
-smoke coming from where oil goes into, ONLY!
- found mud in radiator, flushed it out. Haven't blown it out tho.
-idle and drives rough, studders, stalls when slowing to make turn or at a light
-recently had a oil and oil filter change, and new fuel pump put on.
I have already driven 2500 miles, what is your opinion ?
what seems to be the problem ? there is no code only not complete.
Needs: Spark plugs & wire set. Intake manifold gasket set. Valve cover gasket set. An EGR valve adaptor. Total parts and labor will be $825. Front axle and rocker panel are rusted and will not pass next inspection. Should I invest the $825? Or scrape the car? Thanks for your help.
An also the light doesn't always come on when the car is started. Sometimes when k go over a bump in the road it will make the light come on and then if k go over another bump the light will go off.
When I start the car it all comes on an goes off bit when I holD the brake an put it in gear the light comes on so what can I do I heard a lot of different things? I took it to get hooked to a system but the codes say PO128 an thats a tempature problem an i know it not that...Plz help
Comes on quite often and sometimes stays on
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