I've been experiencing a boost issue and idle issue in my 9-3 SS, with the B207R. I've replaced the plugs and gapped them correctly. (BCPR7ES) I think is what they were called. Newish used coilpacks were also installed and the issue, still ensues. To explain more in depth, the idle issue occurs every maybe 15 seconds with a single rough JERK. And it happens intermittently. As far as the acceleration problem it's a little harder to explain but I'll do my best. It seems to only happen under medium-heavy acceleration but between 30-40 and 60-70 mph the power increases then decreases sharply causing it to rock back and forth. Anybody have any idea what the issue could be? Not sure if this is related but I also have this issue where a fluttering whistle noise occurs when approaching higher speeds. (Usually above 60 mph) Any help would be appreciated.