First off i would like to thank everyone for the assistance. I am still pondering my issue. Let me go into a little more detail. S/N D187V31527B. Gave the Lift Truck a tune up 2 months ago, all was fine. We had a radiator issue. Installed NEW radiator. All is fine. A week or so later we started experiencing stall issues. Replaced LPG filter and vaporizer. No change in the operation. Removed carb cover and checked the diaphram, no holes, saw a couple weak areas. Did not replace. Found a leak at the intake/exhaust gasket. I don't know who did the repair on this but i found only 1/2 a gasket, someone cut the gasket ends off. The exhaust was gasketed with what looked to be Locktite 515. The repair lasted a few years. Replaced the gasket. No change to the stalling issue. :( That's where i'm at today. 3-30-2012 Going to do some electrical checks today, also checking sensors, "it's always a sensor issue" (Joke with the Mectron Engineering guys.) Thanks again folks.

Shannon Precision Fastener