hi iv got a quadzilla rs6 quad with what i think is the cfmoto 600 efi engine, if this is the case could anyone give me some advice, its just over 2 years old, fue months back it started running ruff and cutting out, there is a warning light flashing on the dash this flashes all the time. its been in the garage for a couple of months, but they cant find any faults and say it runs good every time they try it,,,, and given it back to us saying there nothing else they can do, i got on it yesterday after it being sat for a while and it ran well, went for a 15 min blast round field with no problems and also the warning light stopped flashing, 2 of us jumped on it for a 10 min run going alot slower, after 10 min it started sputtering and it broke down, it did start again but ran ruff as hell and just genraly nearly dead, can anyone offer me any advice on this, or do i just give up with it, cheers for any advice