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My 335i had a rough idle when i first got it, fixed it when i did a walnut blast, changed plugs and replaced 2 injectors (because they where the oldest ones and all the rest where pretty new). I put thought into just how much carbon these engines have, main reason i actually want to go over to full e85. My buddy has a 335i running 100% e85 and puts out about 800hp+, had the car from 36k miles till 120k now and has never had an issue. Kinda tells me that the cars run much cleaner and better on it, but thats off topic
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