Driving 74 mph on highway with cruise control on. subtle, repeating forward jerking motion felt for 3 seconds, then went away. check engine light was flashing during the jerking motion and turned off when jerking motion stopped. the jerking motion and blinking light came back 4 to 5 times before becoming violent. i pushed in the clutch pedal during the violent jerking motions and the engine shut off (while still at 74 mph). kept the clutch pedal pushed in and pulled over to the shoulder and attempted to restart the engine, but would make one click noise, then stop. car towed to mechanic and found broken valve springs and rocker arms inside the engine.
This may be similar to the current recall posted for earlier models of the scion fr-s and subaru brz, however my car was manufactured after the recalled production time frame. (cuts off at september 2013, my car was made in december 2013) my car is a 2014 subaru brz manual and when idling stationary, once in a while rpms drop and car shakes as if it's trying to stall. this is more noticeable when i tap the gas pedal and rev the car just a bit.