Hi everyone, i would really appreciate it if anyone could help me, i know im not a regular poster here, but im always reading your advice, I have read through the forum, and alot of people seem to be having a similar problem, the only thing is alot of the time they dont post follow ups to let us know how they got it sorted, so i promise to do at least that! anyway...

Iv been restoring my escort for about 6 months now.. and its ready to go for its MOT, so, after an oil change, i went to fire her up, and bam.. she was running for the first time in a month.. didnt seem to be any problems, but then it cut out after a couple of mins, and wont start back up unless i leave it for 10 mins, or if i take the air filer off and push down the flap in there, it will fire up, and keep running as long as i rev the engine and push the flap at the same time..
I have checked all of the boost hoses for leaks and they seem fine, the only thing i have noted is a slight hissing noise coming from behind the inlet manifold, is that normal? All the vacum tubes seem ok also.. oil cap has a good seal etc..

Please any ideas will be great, i feel dis heartened after spending so many hours getting her looking good.. Thanks, J