Nissan Repair: nissan terrano engine overhaulled, fuel pressure regulator, mass airflow sensor

Question
my nissan terrano has just been overhaulled but there seems to be a problem when i start the engine its idling is ok but when i engauge it to drive it does not pick raves what could be the problem i had the car taken for diagnostics and it said all systems are ok

Answer
Sunny,

If a petrol engine then you need to look at timing, mass airflow sensor and fuel pressure.

I a diesel engine you need to look at the fuel pressure regulator first.

In either case check for engine codes and if there are none then check the parameters for ignition advance and fuel pressure and delivery with a gauge.