2005 Hyundai Sonata Questions

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It makes loud noise whenever car is running .

Past 2 months, my Hyundai Sonata, 2005 has a lower idle at 700rpm, very rough idle and shaking.
Could this be the Egr valve malfunctioning?

The heat comes on set at 250 Fahrenheit

to take off after adding gas you have to keep your foot on the brake and gas put it off and then once you get going then you're ok and it's hard to get it crunk I took it to the shop and they can't figure it out

It stops when reved up but starts again when I let off throttle and continues to rattle during driving pleeaase help!!!!

Anytime I have to use my break when driving, the entire car shakes & rattles

Twice in the last couple of months, my car didn't start up after it had been sitting 3 or 4 days. Mechanic checked the battery and alternator, but found no problems there. I finally bought a Stanley Fatmax professional power station, and the instructions want to know whether my car has Neg or Pos grounded system.

Steering pressure hose first. Which should I believe?

Replace upper arm control

The light comes on but if I reduce speed it goes off, but will stay on after a while. It seems to hesitate going up inclines or from lights. Light stayed on for a day after town driving then went off. It only happens when I drive into SLC in fast traffic.

cat converter looked reasonably clean , still throaty and lack of power no acceleration ?? checked air intake for splits or cracks found none.

it is ongoing all the time on acceleration attempts, drives like a slug, even worse attempting any hill climb having to drop back a gear to even just make hilltop.
I have had a air flow meter and purge valve replaced after a diagnostic with no cure, I have put new spark plugs in also.
It makes a deep throaty noise revving up and during acceleration . I noticed today whilst i revved in driveway that it sounded deep throaty noise but during a bit more higher revs it sounded spluttery and sort of tinny sparking noise. best way i could describe it sorry.Hope you can help please as Ive stumped 2 mechanics who helped free of charge.

So I have my top timing cover off and I have my bottom camshaft lined up but my two other pulleys aren't on their timing marks what is the best way to get them on there marks? Just keep using my ratchet and socket to turn the belt till they are in line? The belt didn't break and there aren't any missing teeth it looks like just need to get them in line best way?