low power

[Troop]

Hi i have the elite insignia 2009 1.8 petrol ive changed the camsaft senser and the mass airflow senser and the camshaft senser the problem is when i accelerate theres nothing till about 4.500 to 5000 rpm then theres everything im thinking of having it remapped or is there anything else might be causing this problem.

[Vauxhall Owners Club]

Is the engine turbocharged?