i have just changed my HGs and my car is now back together. it is running just a little on the rough side and all the smoke is now out of the pipes. how long before it will return back to normal? i have all the vac lines sealed. also my radiator on the coolant lines are getting VERY hot and stiff while its running but the gauge only has gotten up to straight up and down. i think it may have some air in it or something, would that cause somethin like that to happen? thanks guys.