The vehicle runs great, but will not go faster than 35mph on 1996 Chevrolet Tahoe

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2 answers
Fuel filter, cat convertor restricted?
IF it's running 'great' , are you able to determine on your own if it's trans related? Does engine RPMs go high , but still wont go past 35 , or is trans not shifting/or slipping? More details of conditions maybe? Does it go faster down hill? IS there a large floormat stuck under the gas pedal? Is it overheating at all?