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1990 Mercedes-Benz 300SE Questions

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Car started with hesitation so I replaced fuel pump and filter and air filter.hesitation has gone away but now car slows down when you give it gas and speeds up when you let off gas
Started with hesitation
the car idles fine in park, when put in drive it skips, have changed spark plugs, new disturber cap and rotor, new spark plugs wires, have cleaned the idle control valve, and checked houses for wear and tear, all is fine. It just idles like it wants to cut off when in drive and reverse.About 6 months ago I put new fuel pump, and filter on and car has was fine, it was when after I replaced the distributor cap, rotor, spark plugs, spark plugs wires about a month ago when all the problems started.
Which water tube should be removed to exceeded water
i replaced the battery and the pump will not engage
my car runs for about 25 minites after that stop running and will not start for 39 minties.
the car will pick up speed for no reason
HOWEVER, THE ["BRAKE-PADS"] ARE LOCKING ON THE ROTORS & WILL NOT RELEASE THEMSELVES. SO, WHAT COULD BE THE CAUSE THIS-PROBLEM?
I I NSTALLED BRAND NEW (PADS-CALIBERS & ROTORS). NOW THE BRAKES LOCK-UP WHEN I GO TO DRIVE-IT.
THE CAR HAS MAD 475000 KM
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