Question about GMC C3500
I assume that you have an automatic transmission, It sounds like your torque converter is the culprit here. The TC is what allows your tranny to be in gear, but not stall out the engine (you probably know this already). If your TC is "locked up" all of the time, it will cause the stallout that you describe.
Posted on Sep 17, 2008
Tips for a great answer:
May 01, 2014 | 1994 GMC Sierra
Apr 13, 2013 | 1995 Chevrolet K3500
Jan 28, 2011 | 1995 GMC Sierra
Jan 21, 2011 | 1995 GMC Sierra
Please see my tip at http://www.fixya.com/cars/r7427423-fix_poor_idle_high_idle_stalling_fuel . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
Jan 09, 2011 | 1995 GMC Sierra
Jun 06, 2010 | 1987 GMC VanDura
Sep 04, 2009 | 1985 GMC K3500
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