Question about 1991 Chevrolet C1500
It sounds like there's a vacuum leak. It's been a while since I've worked on those vehicles, but, I'm pretty sure there's a valve body on the transmission and should be vacuum controlled. When shifted out of neutral, it loads up the engine causing an increase in vacuum pressure. If there's a leak or stoppage or any sort of interruption, it could cause this issue. This does not sound like an engine or transmission problem. It sounds more like a system (vacuum system, valve body) issue. I wouldn't be too concerned with the condition of the engine or transmission themselves, more so the solenoids or lines attached to them. Start with the vacuum though.
Hopefully that helps get you started. Good luck
Posted on Mar 03, 2009
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Posted on Jan 02, 2017
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