turbo 3 idle, vsv advice

[wesbam1]

hi, in need of help with my mk3 turbo the other day I noticed two switch type objects connected to hosing and an electrical connector they both look the same both have a black cylinder on the end, these are just under the intake manifold the problem is I found one of them just hanging by the what looks like thin vacuum hosing Im thinking these are the vsv valves I was just wondering if these could cause a bad idle as the car sometimes idles at 500 rpm then sticks at 12oo rpm when hot,I have the code 51 but was just wondering if these could cause similar problems especially with one hanging off the engine for ages.is it me or do the supras seem to suffer idle problems all the time? it seems as common as head gasket problems ,which Ive had done Id be greatfull of any advice thanks.