Hello everyone.

Im wondering if anyone has experienced a problem with a K21 engine not firing on all cylinders.

This is a Mitsubishi FG18ZN 2007.
LPG nissan K21 engine.

It suddenly stopped sparking on all cylinders.
Cioled down for a few hours then started sparkling again.
Did this several times over several weeks.

Then ceased to spark, displayed E28 fault.
Ckeared the fault with the "pedal dance"
Removed the crank and cam sensors, they appeared to be Chinese, images attached

Purchased both sensors from TVH , they had no markings on them, so probably chinese also.Installed and only firing on one cylinder. Displayed e34 fault. Cleared the fault.

Now seems to fire in cylinders 1 and 3, other plugs spark but don't fire.
Engine will stop once starter is disengaged.

Putting the original crank sensor back in didn't change anything.
Putting the original cam sensor back in resulted in no spark and rhe E28 fault again.

Appreciable any advice, thanks in advance for your time!