Thanks for you all helping ..
Checked with foreman already, carb don't have fuel pump relay.
Maxx you are right, carb using mechanical fuel pump attach to the engine camshaft.
The foreman told me suspect the carb has problem. The fuel overflow in carb when heavy foot on accelerator and cause the car engine RPM not stable .. He suggest bring the carb to wash .. But I not sure it can cure the problem or not. Maybe will goto halfcut shop look for one carb to replace. Not know how much ...
Car symtomps is like that
1. Morning very easy to start up ..
2. When engine run hot, RPM some time not stable ... from 1000 drop to 200 and die ..
3. When engine die, must let it rest for 10 minutes .. After that only can start the engine. If nope.. no matter how you start .. the engine also unable to run ..
4. Drive slow without a heavy foot is OK .. No problem ..
Your guys got any idea??