I have a 93 RRC 3.9 V8 320KM conversion to LPG only 30K ago no mods to head but always start and do a fair bit of running on petrol. I am having a problem when on petrol that when trying to accelerate from a standing start the accelerator moves and moves until vroom your off, on LPG its the typical gradual acceleratrion as you push the pedal. Have cleaned the MAF with MAF cleaner no change, wondering what to look at next , I also dont have an ODB display box fitted for some reason I have one bnought from ebay but have not been able to see where the connector cable.wire is maybe mine wasnt fitted with one... all help greratly appreciated.