I think I'm onto something finally with the vibration. Haven't data logged in a while (since before the vibration). I've noticed that instead of commanding an AFR of 14.7, my car is commanding 13.79 (very rich!). And at DFCO its commanding 27.58 instead of 29.4. It gets super rich at 1k rpm (where my vibration is the worst) at a measured afr of 12.8. I haven't touched the tune....so any ideas as to what would would cause this? Wideband O2? Downstream O2? MAF? MAPs? It also commands 13.79 consistently during cold start. Its like its stuck at the 2 numbers. Now...the only time I haven't been with my cat was during the whole Belle Tire fiasco over a year ago. So I know nobody has changed the tune or done any OBDII stuff to it in over 3 years.