First I would start with compression tests to ensure I had no internal problem and a good starting point, then if test was good I would verify that I maintained ignition spark, after that I would remove lp hose to carv and hold 2-4 inches away while cranking engine to make sure I was not flooding with fuel. Good luck, by the way ( not to be smart) a real forklift mechanic would have diagnosed the problem and given you an estimate of needed repairs.
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