'92 190E SLUGGISH TRANS

The synthetic transmission fluid, and filter I had put in last year, promptly, and slowly, seeped out, through gaskets and fittings, and caused me to have to add 2 quarts of Dextron when it was found to be
low, 60 miles from home. I recently had fluid and filter changed back to Dextron I drove maybe 100 miles on this mix. with no problems. Now, instead of slightly pressing the accelerator to engage passing gear, I have to stomp on it. and when at 70 mph, if I removed my foot from the accelerator, the car would seemed to just coast, there is now immediate engine braking Does this sound like transmission damage. or a bad adjustment, or loose vacuum line? The same shop did all the work Recent: Cat, to back exhaust replacement Differential fluid change, clean vent bolt Transmission fluid change and filter. Thanks for any assist..................RIck
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With synthetic, tranny runs smoother...and as you felt when switching back... harder with normal fluids. I suggest you drain the fluids out three more times. No need to change filter or drop pan... just drain it after a couple of hundred miles... for a couple of time to eliminate the synthetic fluid completely.
And see what happens next.
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