FLUTTER over bumps, POPS on parking turns

When going over speed bumps my front end "flutters" as if something is loose. I have replaced all 4 struts (Monroe Sensamatic quickies), sway bar linkages and sway bar bushings, outer tie rod ends, inner tie rods and a new rack. The flutter continues and now the front end "pops" when backing out of a parking place and turning the wheel. Mechanic says everything is tight, and new. The only part I have not replaced is a triangle shaped part that rock-auto lists as another control arm. Says also that body bushings are new. I am completely at wit's end.