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Does anyone have any ideas as to why my 2003 Audi A3 1.9 TDI Quattro loses acceleration ?

Only occurs on the motorway after driving approx 50 miles between 70 & 80 mph, it feels like some sort of blockage is occurring and just goes flat which can be a problem if overtaking at the time. If I switch engine off for a while it returns to normal


I think it's your MAF.

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