hi guys,, im having a problem with a conversion im nearly finshed doing..when i start the 90 its runs very fast..i know i had some intercooler hoses ect mixed up but i beleive they are sorted now.. i slackened off the throttle cable.. slackened the bolt that allows the throttle linkage to goes back to rest further back..when i kill the engine i hear a slight hissing noise so guess i might have an air leak somewhere but cant find it as its stopped by the time i get under the bonnet.. any suggestions, its a defender 90 2,5 na with a defender 2tdi installed..thanks guys..,i was trying to post this in the tech bit but it said i couldnt.. cheers.