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It sounds like your car isn't getting the proper amount of gas. You say your mechanic changed the fuel pump and the regulator. Id have him run a diagnostic tool on it to see if it throws any other codes. Its getting fire. Try changing the FUEL FILTER. it maybe clogged. maybe the pressure regulator is not giving it enough pressure to push the gas into the engine or maybe the fuel pump is only working at times. Does it run good and then start to spit and spudder then die? if so its not getting gas some how. Idk if you can adjust the pressure regulator or not. i mostly work on old school cars.
if it is puffing white smoke,you have lost a piston ring or broke it.the white smoke is coming from oil burning around the piston.your hard strating is due to the fact that you are loosing compreshion in the motor.take it into a mech.and have them run compreshion test on it.GOOD LUCK pretty spendy!
Have the FLEX PLATE checked. If thats o.k., then it sounds internal, like a rod knock, maybe? If the noise is coming from the bottom of the motor Oil pump might be restricted, sometimes the oil pickup unit gets clogged with sludge. By the time you realize it, the damage already has been done, unfortunately.
Maybe one idea. Going to Florida has nothing to do with the noise except makes you scared being away from home. Sometimes front wheel bearings go bad-all of a sudden. Not bad where the wheel will fall off but starting to make a noise like a airplane prop. A humming low pitch sound but almost constant. Not enough to feel it in steering wheel. If this decribes your sound-noise chances that is what it is. DON'T worry you can travel many, many miles with this noise. My mini van started doing it 20,000 miles ago. I got the parts but it's a bear to replace. I hope this helps you. If you need parts go to ebay.
I would like to add onto dallen4582's list: check to see if something is in your tailpipe, or maybe even a clogged catalytic convertor. To check the cat. take the car for a ride at night, then look at the cat. to see if it is glowing, if so, replace the cat. The air sound could be the exhaust trying to get through the cat. but can't, so it's finding the easiest way out. probably at the flange. Best of luck and wishes.