Mind you, I am being creative here. All I know about these diesels I have learned via my membership. I am not anywhere near being a qualified diesel mechanic.
You could try to get the engine to kick up into high idle RPM's. In this way you might be able to rule out the Accelerator Pedal Positioner sensor versus computer fault.
For starters read this message thread in the 6.5L Turbo Diesel Forum
High Idle on an EFI 6.5 (http://www.62-65-dieselpage.com/ubb/Forum1/private-vFfydy155/HTML/000672.html)
Also the National Truck Equipment Association (http://www.ntea.com) has fast idle technical reports that you can purchase.
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I started with the NTEA Aug. 1997 (TR97-08?)"Fast Idle Procedure for 1998 GM 6.5L Diesel Engine" (it's old web address is dead, I had lucked out finding it.)
Which lead me to an April 1994, T94-6 "1,360 RPM Fast Idle PROM For 1994 GM 6.5L Turbo Diesel Engine"
And to a November 1993, TR93-8 "Fast Idle Procedure for 1994 GM 6.5 Turbo Diesel Engine"
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Good luck and more power to ya.
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Member #2400, Norwich, CT. dave_65td@hotmail.com
As of Summer 2001:
1994 Chevy K1500 6.5TD Blazer, 4WD, 4L80E & 3.42 Posi.
Acquired in April, 1999 with 105,000 miles on it.
Currently 150,000 miles with new DS4 by self at 138,500 miles
Self-installed mods: Diesel Pro Phazer dual-idler gear set, 97 water pump & thermostat manifold, marine injectors, FSD Cooler and resister upped 7 to 9, all from Kennedy Trailers Sales and Service (http://www.td-max.com), USA distributor for Diesel Services Group (http://www.dieselservices.com/gmc.html).
Hella (http://hellausa.com/) Vision Plus Halogen conversion headlamps, Bilstein shocks (http://www.bilstein.com), Northland (http://hotwipers.com) heated wipers.
Jannetty Racing (http://www.jannettyracing.com) installed: mandrel bent ATS (http://www.atsturbo.com) 3" down pipe & DynoMax (http://www.dynomax.com) 3" Cat back exhaust, plus yanked out the Snorkle & milled out the diaphram in the Air Inlet Duct.
1995 GMC K2500 6.5TD Sierra SL, 4WD, 4L80E & 4.10.
Acquired in April, 2001 with 140,400 miles on it.
Currently 145,000 miles, with new DS4 by prior owner at 32,600.
Mods: AMS Oil 2-Stage foam air filter element (http://www.amsoil.com/products/ts.html) (I found that their #S1443 (http://www.amsoil.com/products/s_filters/specialorderfilters.htm) fit better than the regular offering).
Eventually both vehicles will be equally upgraded.
Oops had to fix a bad link http://www.62-65-dieselpage.com/ubb/redface.gif
[This message has been edited by David B (edited 07-20-2001).]
Oops forgot to correct the abreviation http://www.62-65-dieselpage.com/ubb/eek.gif
[This message has been edited by David B (edited 07-20-2001).]