Hi, I have an astra h 2008 1.8 automatic, Car won`t start but turns over, if I spray brake cleaner down the air intake I can get it to start, I then need to hold the revs for a minute to stop it cutting out but once this is done it runs fine and I can drive to work with no issues. Once engine has warmed up I can turn engine off and will start again ok but when I come out of work at end of shift I have to perform the same ritual of spraying brake cleaner to get it started. I have changed the plugs, changed the battery, had the starter motor off and powered it up off the car and works ok, Checked the fuel pressure from the bleed valve and all seems ok. Can hear the fuel pump when I turn ignition on so believe this is ok. I have no faults on dash. Any help with solving this would be gratefully appreciated. Not sure if its related but the fan has started coming on and staying on even when its -3 degrees outside.