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surging at low rpm under load
Hey so I am new here and I have an 07 335i with the n54 that has been modified with a single turbo kit aftermarket pumps and straight pipe 3inch from turbo back but I am having problems with surging all of a sudden it’s random and only at low rpm when driving “normal” if I step on it and get into boost it’s runs great afr’s stay around 13.8 to 15.2 normally but when it surges drops all the way to 9.8 to 10.2 but it all started when it rained pretty heavy I just don’t know where to start any help would be greatly appreciated
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