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Sounds like your MAF either needs a clean or needs replacing, also what sort of condition is the air filter in?.
Also are you running a catch can Ben? if not you may find your Intercooler needs a good wash out.
My series 2 had the same prob with the engine light coming on but it has never come back on after fitting NADS.
Last edited by 45/70; 12th March 2012 at 03:21 PM.