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Get those check engine light codes read. They should give a big clue that could save lots of time. Otherwise we are just sitting here guessing. The list is very long for things that can cause those symptoms.
This sounds like a fuel problem, I would check the IAS( Idle Air Speed) motor located on the throttle body , possibly a wire problem try wiggling them first to see if it changes the idle speed or stops the surging your referring too ! has a check engine light come on at ant time ?
this is most likely the torque convertor clutch(tcc). take it to a trusted transmission shop in area and replace the torque convertor. sorry i dont have better news. happy holidays
The very 1st thing that must be done here to start diagnosis of this problem is to have the PCM (powertrian control module) scanned for fault codes, that is key to fixing this right first time. In most area's Autozone and O'reilly auto parts do this test for free (except California).
there is a wiring harness that goes over the trans. bellhousing that has a tendacy
to short internally, wiggle the wiring harness and see what happens. not a for sure fix ,but hope it helps.
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