My 1994 'M' S2 is currently stalling at idle and running rough. I have had a 270bhp upgrade and full engine rebuild at Kim Collins Quattro Centre. Also fitted was a Milltek Hi Flow Cat Exhaust System. Having had the vehicle code read, it is showing the following faults.... Air Mass Meter and Lambda. My Carbon Dioxide reading is 5%. I have also had 2 recent treatments of Forte Gas. What is going on? Any help would be greatly appreciated......... 
It has only recently started doing it so I will try and connection and if no luck my local specialist will carry out the work.. I will keep you informed!
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