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I have a 2007 9-3 2.0T that has been running extremely rough idle and literally no power. I have no idea what else to do it has thrown many many codes with a wide range of meanings behind them. Some codes were for throttle body so I replaced it with a basic re-manned one but took it right back off because it rattled worse than the original one. I have put 2 sets of new spark plugs, first set i took back out a few days after putting them in and cylinder 2 and 3 from the left were almost completely black so i bought another set of NGK spark plugs with a different number code (that i found on these forums that would help my car... It didn't...) pulled those out and the same thing Cylinder 2 and 3 from the left are black... I don't know if i should go straight to replacing those cylinders coil packs or not because they aren't cheap... I've also been thinking about the ionization module being the issue also? Please help, thank you
 
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