i bought my 2002 TJ Sahara a little over a month ago. It has not had the power that my 1999 Sport had. I was very disappointed with it. I changed the plugs today. On my test drive the change in performance was huge. It started up quicker and the power was dramatically different. I checked gap on the old ones and they ranged from .063" and .072"! Needless to say the electrodes were worn way down. My new plugs were Autolites APP985 but I think that any new plug with the proper .035" gap would have made a world of difference. One more thing down but in the process noticed the rear of the valve cover was beginning to leak. I guess it never ends.