So as I am looking at the measuring blocks (car running), I smell an odor and notice smoke coming from the drivers side fire wall/engine - could not exactly isolate it. Shut down car and now have another code:16534 Oxygen (Lambda) Sensor B2 S1 P0150 -008 Malfunction in circuit. Restart car - no more smoke still misfiring. Measuring block 2 now has a big difference at idle between Mass Air flow bank 1 vs 2 (5.78g/s : .67 g/s). Also observe the exhaust on drivers side muffler port is much cooler than the passenger side. Gregg is commenting that maybe the 02 sensor wire shorted out.