I have a coolant leak. it appears to be coming from just about where the valve cover attaches just above to i believe to be the #2 cylinder. 1st one on the driver side. i have no indication that it is going into cylinder. truck runs fine but i have lost alot of coolant, and it appears that this has been a gradual thing for i have noticed the evidence of coolant sitiing on intake manifold. question is , could this be a bad intake gasket?, manifold?