Rapidly changes over between gas and petrol in Sprint LPG

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I recently bought a Prado 96, dual fuel, converted on 2005 with Sprint-C system. Since I bought this car it suffers of LPG issues. The car backfires very often, switches off on idle, or when steering fully on idle. Last week I've installed new non-resister spark plugs and ICE 5mm spiral leads, and cleaned the mixing valve. I cannot explain the new behavior, but after the last installation the system changes over between gas and petrol rapidly (every few seconds) , specially when idle (low rev). The electronic control system in the car ticking during this operation.
I tried to tune the idle screw, and the one in the middle of the gas hose, but it doesn't seem to change anything.

I 'll be happy if someone can advise me with the reason for the switch-over, and what component of the system is faulty.

Thank you in advance

[IRON-PAWW Avid PP Poster! Find all posts View Profile Close IRON-PAWW]

It's a very technical question you've asked hergass. These sorts of issues are often difficult to diagnose on a forum. It really sounds like something you'd need to take to the Pro's to troubleshoot. As you're a first time poster, don't think us snooty because we haven't replied. Your question is a doozy. Good luck with it!

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Its fine, just wanted to see if someone faced this issue before. The LPG mechanics suggested to replace the electronic system to a more common one, as this one is not so popular here in Sydney. I posted this question to see if there is any other solution before I do it.
Otherwise this forum is full of useful information, so I believe I'll visit here often.
thanks anyway.

[IRON-PAWW Avid PP Poster! Find all posts View Profile Close IRON-PAWW]

No problem. When you eventually get to the bottom of it though, post up how you solved it to add to our wealth of knowledge here on the forum. 8)

Replacing the control unit will probably be a troubleshooting step for the techs anyway. With strange problems like this it sometimes boils down to a "try and see" method and a step by step elimination of possible problems. A more common system will certainly help you with any future issues that arise.