GQ TB42 dual fuel - rough idle on LPG - troubleshooting help

[patch697]

I think you might still have a vacumn leak somewhere Nick, if its suckin in air it will affect the fuel air mixture. Can you hear any whistlin noise?
It might also be why its idling fast on petrol.

Agreed...... It still sounds like vacuum leak somewhere.

With the engine running, slowly go over all your vacuum lines with some WD40 or CRC one by one, from end to end (most important to go slowly & do one at a time), then in & around where there connected too.

If at any time the idle changes you've found your leak.

If you wait a few seconds the Idle will return to what it was, at this point spay the area that you got the response from again to confirm & if your on the money fix the leak.

If your successful here im tipping your problem will be solved.