My 5 yo Persona lately give me a headache. When I ramp the car at high RPM and slowing down afterwards, the engine will switch off and I need to restart again.
It happen when it's a low speed or idle, you can feel the car like choking and the RPM suddenly ramp up then fall down very low and the engine stop.
Bit if normal day I cruise at normal speed and never hit the paddle very hard to ramp it, it seldom happen.
Been sent to Proton workshop twice for checking and still can find any fault, even then mechanic was with me for the test drive.
They change the fuel filter, air filter, crank shaft sensor and perform full body throttle. The problem still exist...
Any clue?

Spark Plug changed too