I got down & dirty replacing tha Crank Angle Sensor - didn't solve my problem
On the other hand, I did finish off the first stage of my home-brewed snorkel.
With some plumbing supplies & a pod style air filter I've routed my air intake to the cowl beneath the windscreen.
The only drama I had was the car stalling on LPG when I came to a stop or even backed off on the skinny peddle. Turns out to be a common problem with LPG & snorkels. A bit of advice from an LPG mechanic, some plastic tube, a couple of fittings & 1/2hrs work problem solved: a balance pipe from the airbox to the diaphragm in the convertor.
Some pic's:
Stage II will be to route some ducting through the cowl to the front guard to a snorkel I'm yet to fabricate