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Madly in love with my new (new to me)baby, she***8217;s throwing a P0304 code after driving about 3 hours on the highway, started with a minor skip when accelerating from 75-80 mph then started stuttering and skipping, stopped for a bit let it sit and was fine, got back out on the road and about an hour later started stuttering again. Got her home and she***8217;s stopped stuttering but CEL is on. I normally get ethanol free 93 octane but I couldn***8217;t find it anywhere in South Carolina so I got her 93 octane but it was %10 ethanol. Could that be why she***8217;s misfiring?
 

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Hi and welcome to Bimmerfest :wave:.

Misfires can be difficult to diagnose on these cars and there is a very long list of things that can cause them, if you have access to the BMW software I'd start with that along with ensuring the battery is up to scratch.
Throw a post up in this forum and they should be able to help you.
 
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