| Look for yourself! If you want to monitor your air/fuel ratio then I suggest a good wideband setup, just search the site... there a ton of great info on gauges and sensors. As far as misfiring goes, it's a pretty simple self check (just pull your coil packs 1 at a time while the engine is idling, if the motor isn't affected by it, then that is the cylinder that is missing) Suggestions: Since you have high miles I would compression test the motor and check for boost leaks, get an aftermarket boost gauge, test fuel pressure, and the motor can probably use a 120k maintenance kit or something (unless recently done by P.O.)
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