Originally Posted by cjwood555

Can't see how a dump valve would affect idle when there's no boost! Would be looking at post-cat lambda sensor perhaps if it's ok when warm.

Ref: screws - is it the standard scrivet things (black plastic screw and plug)? If so they're used all over the engine bay so bound to be available seperately somehow. If it's those cheese-head machine screws / bolts then just get some from a fastener company - or farnell are good for most sorts of screws. Clips wise, just bend a 1mm strip of ally and drill/tap a hole through it.

Chris