While driving engine started revving high without shifting

1986 PONTIAC FIERO
80,000 MILES • 6 CYL • 2WD
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MAMATEETEE7
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Car has suddenly begun to act strange as I begin driving and increasing my speed it just starts revving, but won't automatically shift and continue to build speed. The only way I can get it to continue to go is to put it into 2. This is an automatic transmission car. We took it to a shop where the mechanic found a very worn cable that he felt might be part of the problem. He replaced it. Then he replaced transmission fluid. Car is still not shifting. Then it appeared to be overheating and before I could pull over, it shut off. It has started fine since then, but still has the high rpm's with reduced power. I am really hoping that it's not the transmission because I do not have that kind of money right now for a pricey repair. Do you have any suggestions on other things it might be? About a year ago it made a funny sound a few different times and mechanic thought it might be fuel pump, but hasn't done it since.
Jul 1, 2019 at 8:27 AM
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STRAILER
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Hello,

It sounds like the governor is not working right. here is a diagram below to help show you how to repair the problem. Check out the diagrams (below). Please let us know what happens.
Jul 2, 2019 at 4:12 PM
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MAMATEETEE7
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Thanks for your reply. That sounds very complex and expensive. The engine has to be pulled? Yikes! Can you think of any other possible solutions that might be simpler and less expensive to try first? Thanks, Teresa
Jul 2, 2019 at 11:28 PM
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STRAILER
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We can try running the odes to see what comes up. here is a guide:

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Please run down this guide and report back.

Jul 3, 2019 at 11:46 AM