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Does it have any power when you start moving? I've seen a lot of plugged catalytic converters. You may want to have an exhaust back-pressure test done.
My 99 GMC savana 1500 was chugging at like 50 60 mph and gas gauge was stuttering ..it turned out to be computer..I had it re flashed by GMC for 150 bucks ..that fixed all...hope this helps
1997 GMC Subburban 1500 loses Tach Speedo and Trans sticks in High Gear. I changed the ignition Starter switch which I read was the problem but problem is intermittant and still exist? AMMCO told me to try changing the Neutral Saftey switch first, but didn't say why?
Check the transmission pan for filings, clean out. Refill your transmission fluid. If this doesn't solve it, the gears have been ground down to far for a cheap repair.
If you're doing 60-70 in 2nd Low, your tranny is probably already shot.
Unless you have run over something or something has hit the linkage that you may possibly repair to adjust the gear locations to their proper place on the trans, you must get trans checked out.
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