Ive had this on my et and det. Have you got any exhasut blows or as tim says a dump valve fitted. Sometimes a faulty or wrong specced dump valve can cause the problem.
Give the old girl a good old service mate and check sensor plug contacts, boost hoses are all good and tight ,Also listen for hissing around the inlet at idle too(vaccum leak)
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Originally Posted by s13eater
i wished my cams cost only £130 each, i must have c*nt wrote on my head 
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