Car starts up fine just got a rebuild on the engine but sometimes while I知 driving it seems to run out of gas then goes back to normal then it値l start doing it again randomly

 

Hard to fix with almost zero information provided.
If its turbo, it might be hiting boost/fuel cut (check boost levels)
Fuel pump speed switching relay/resistor might be acting up (check fuel pump voltage when driving)
Fuel pump/filter/wiring issue?