Just got a rev 3 n/a.
Alls well apart from everytime it's started, it seems to rev up to high idle fine, and then the revs just plummet, don't stabilise, and it tries to hold on but then stalls. If its revved until semi warm it runs fine?I've taken the throttle body off and cleaned that as it was quite gunky inside, and found that half the gasket was missing so no doubt has been sucking in dirty air.
Put it back together with a new gasket hoping the problem would be solved but no luck! 
One last thing, could anyone tell me what the single pipe goin into the throttle body at the top is for please?
Thanks in advance for any help!
