Quote:
Originally Posted by Skillen
Can of aerosol/butane gas spray it around the manifold/ iacv/ tb and if the revs pick up then you'll have found your leak.
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Personally I wouldn't spray a flammable gas around the engine, WD40 works quite well. What you'd have to do is drive the car until the revs, stick, roll into a layby, pop the bonnet and spray the WD40 around until the revs drop, after a little while I'd expect the WD40 gets sucked through and the revs pick up again.