I'll be in 3rd gear and it usually shifts at 40 or a little below into 4th. I accidentally power brake only for a minute. Now when the tranny shifts into any gear it is around 3200 rpm. Also, it shifts into 4th when i take my foot off the accelerator, that could be anywhere from 40 mph to 50mph.?

Any Ideas?

Bowden cable, or floor mat (no joke). What do you mean by "power brake"?

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1989 300E 144K

you hold the brakes and the accel pedal at the same time.

What am I looking for when i inspect the floorboard carpet? Lint stuck under the pedal? I wish i knew more about this car. I've owned it for 3 and a half years and i still am discoverying new things everyday.