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I'd look at the fuel issue more. Drain the carb into a little, clear-ish dish like a tupperware. depending on the carb your have, you might have a drain plug/bolt on the aft starbd side. Throw the dish under, pull the plug and look at the fuel. Most dodgy a4 issues are just bad fuel or dirty carbs. I got water in my tank and draining the carb showed it exactly.
If you don't have the draining carb or don't feel comfortable messing with it, pull the carb and put it into the dish. Emptying it out won't hurt it and will tell you if you have bad fuel.
Look for water at the bottom as well as dark/tarnished fuel. If it separates out, you know exactly what you've got.
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