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Hello, I have a 95 G3500 GMC and I have the same problem. I found that the throttle position sensor (on the side of my injector pump) is the possible problem along with the computer going into limp mode when I floor the pedal for passing speed. All I do is sycle the ignition switch three times and it resets the computer and the shift problem goes away until If I only press the pedal 3/4 of the way to the floor it seems to be ok. I haven't tried another TPS because it cost a hundred bucks and I'm not sure if it will cure the problem. As long as I know what to do to keep it shifting i'm going to leave it that way. Gil |
RV and bus conversion info since 1996.
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