My car is slightly surging when Im driving it. I have decent power still. I just had the charging system all checked out. Its all fine there.Might be my injectors? Ive put in Lucas tune up once and noticed a difference. Any info on this would be much appreciated. Cheers!

Check the mass airflow sensor or whatever sensor it has for that and check for intake manifold vacuume leaks

Would that be the map sensor?

Purge air from the cooling system by opening the bleed bolt and filling the radiator with coolant, until fluid comes out the bleed bolt. Air in the cooling system is the usual cause of surging.