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Message: <blockquote data-quote="leforte" data-source="post: 289776" data-attributes="member: 1943">you should be having a 7psi kit for your automatic 530i. so 0.45bar should be close to the target psi. your -0.7bar idle pressure seems ok, check on the pre compressor throttle body connection, probably a slight leak there.  the surge/jerkiness might be due to sudden lean AFR that causes a pull in timing. btw, did you replace the fuel filter? If no leaks were found? go on to trouble shot the ignition side. try changing a new set of plugs, just use the oem copper or platinum ones. next, clean the MAf or if you can borrow another MAF from a working car, try it on. also check on the crank angle sensor and its reading via dis/gt1. If none of the above is abnormal and no error codes shown, then I suspect incorrect cam timing and realignment of the cams is the next step.</blockquote>