Engine turns off without warning. What did I do now?

There are 3 sensors on ur Z that need to be replaced, Crank & Cam sensors. 2 behind the engine and 1 underneath opps side of the oil filter. Also a NEW throttlebody solves this because the TB is electric and fails on common high milege Zs. The eletric motors is failing to open the throttle thus choking the motor from receving air and stalls out as you drive. Does not matter if you cleaned the TB, the electric motor attached to the TB can fail and cannot be replaced requiring a whole new TB. I suggest Hitachi brand.