1997 GMC 1500 shakes at 50-55 mph

My 97GMC pu when I get on the fwy I get around 50 to 55 mph and it feel like it want to stall and it will shake into I let off the gas padle it will do the same when I go up a hill when drive around the back street it run ok and it is burning gas to fast. thanks

If you retype this in good English, odds are you will get good answers. No one likes trying to interpret posts with misspellings, unknown abbreviations and no punctuation.

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