good evening people i have a s2 escort turbo h plate n when i start it from cold it runs fine 4 bout a minute n just keeps dying then untill it warms up properly then ok! then wen drivein it 1 min itll tick ova sound then the revs will drop to low n to mins later will rise far to high, its been played with alot and tuned so do you think it just needs a profesional set up? thanks.