Hello I am in need of some help with my older Yale forklift that will not start Model number is GLP 050REJUA086
Serial number does not come up in computer but on identity plate is CH0045

It started out working fine then would randomly die. Progressed to only running for 10sec or so. Would restart right away but die again.
Now it will not start.

Weak spark to all cylinders and from the coil lead.

The fuel regulators have both been changed and appears to be getting propane.

Replaced the following
Cap and Rotor
Coil
Ignition switch
Spark plugs

Tested coil high tension lead and the cylinder leads and ok

12.8 volts from battery
engine block appears to be well grounded as tested at alternator, starter and ignition switch

didnt replace the ignition module because engine had some spark.

I am stumped on what next to do.

Any help would be much appreciated.

Thanks,
Mitch