My old Nissan had developed a bad miss along with a bad case of the back-fires on lpg. Also developed some bad pre-ignition ping when running petrol?
Last week when we had the air intake tube out to fit the snorkel we noticed the bottom of the plenum box on the intermediate tube had some damage from the heat raising off the extractors. This had, during the 6hr drive to Cootamundra Friday night into a huge gaping hole! The ecu couldnt make heads nor tales so we modified the intermediate tube.
Simply cut off the plenum chamber and capped it off with a 50mm pvc end cap. Secured in place with silicon and pop rivets! Made a huge difference, back to a power-house again!
Well, nearly a power-house anyway,,,,,,,,