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Could it be that the PO installed too strong shocks? Bad springs? I lowered the air pressure below 30 PSI looking for smoother ride, but nothing has worked yet. What should I be looking for?
What happens when you put your weight on each corner of the front end, trying to bounce the car while standing still?
I had this condition on a former 240Z and it was the shocks (actually the struts). I would consider new shocks and defer to others on this forum for better advice.