Had this little Audi TT come in the other day with a running issue (bad stumble) and a misfire check engine light. The owner had diagnosed the misfire and put in a couple new coil packs with spark plugs, but there was no change. A lot of times these Audi’s can have issues with low voltage, so I put the charger on the battery to see if anything changed, but the battery was in good shape. I did find a …

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