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Dosent have a clutch switch? It's too old for that tech? And by green temp sensor you mean good ?

So some time I start my car and its perfectly fine, idols fine and revs fine, does have any rev hang at all then sometimes I start it and the revs just keep climbing till near 2k rpm and take ages to come back down to earth. Also sometimes it only starts happening after long drives then other days after doing the same drive it dosent happen. Would this be down to vaccum lines? I'm pretty certain I've no vaccum leaks but I'm looking for some answers or suggestions ?