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Message: <blockquote data-quote="robb15033" data-source="post: 925896" data-attributes="member: 13109">I get a check engine light once in a while, it only pops up when I'm sitting still at idle, either at a stop light or parking lot ect.. Both tune files (87oct & 93oct) produce the codes. I replaced the primary O2 sensors both banks. It doesn't pop up frequent enough to make any connections to the cause. I'm going to get some MAF sensor cleaner, saving up for a fuel pump. I've gone a little more than a week now without it, just trying to be proactive and eliminate it completely. Thanks.</blockquote>