Hello I am in process of buying a lease return one owner 2006 sr5 (110k) BUT a couple concerns... During test drive after 10 minutes of warm up I punched the throttle entering freeway and noticed a puff of white smoke in rear view. Not a continuous trail, just a momentary bright white puff. A moment later I hit the throttle hard again and got another puff. I tried to repeat afterwards but no smoke at all. Should I be worried? No issues with drivability or idle, etc. The other thing I need help with does anybody recommend a San Jose CA mechanic to do a good pre purchase check of the running gear and body for hidden damage? I noticed both front and rear bumper covers seem to be pretty loose is that normal? When I grab and tug a corner the covers move slightly. I would appreciate any and all responses, need to make a decision by tomorrow, 12/23. Thanks!