hi there iv just bought a w reg golf gti 1.8turbo which seemed to be running great however i just noticed the plug was not connected to the maf, i then connected the plug and the car ran for about 10 secs then just cut out, disconnected it again and it seems to run fine connected it again and same thing ran for a few secs and cut out so basically the car wont run with plug connected but seems to be fine when its disconnected, i just bought a new maf from vw and connected it and the problem hasn't went away got the car on the computer and it said there was a problem with the lambda sensor replaced it the car ran great for 2 days its now started cutting out again when idling just as before just wont tick over with maf plugged in keeps cutting out however runs fine when its unplugged, no fault codes coming up now, anyone got any ideas what to check next and can u tell me if il cause any damage driving with the maf unplugged

many thanks