Hey Rooster, my truck is new enough that it has the new PSI engine setup by Mitsubishi, instead of the GM engines used in the past. I called tennant for a service manual for the engine, and they said it doesnt exist!! xxxxx
Anyway, I started to go through it the old fashioned way, pulling spark plugs, filters, etc. I found the fuel filter to be very dirty. I didnt have one in stock, but I cleaned it out with brake cleaner, reinstalled, and viola - Truck runs great with no issues. Im due for my 400hr service kit specified in the tennant manual, however when I received it, I got all wrong parts (The sent stuff for the GM engine setup) But since cleaning the fuel filter behind the LP converter, its ran great.