See this is something that i have been told recently. Retro fitting LPG isnt anywhere near as simple or indeed reliable as anyone suggests. There is plenty of evidence on the net that many car makers engines (toyota being one that springs to mind) simply cannot cope with LPG. Many suffer with a similar problem to leaded cars running on unleaded where the valve seat is erroded away.
I do hope you get it sorted but if they are an acredited fitter then complain to their governing body.
__________________
------------------------------
------------------------------
__________________
|