So im new to all this but I have a problem. My father gave me his 1989 s10 2.5L. He changed the head gasket and i had to put it together, now heres the problem. It was sitting for a year when i started to fix it. Got it together and it runs rough, it also is leaking coolant from the exhaust manifold. I know one of the head bolts needs gasket sealer on it but I don’t know which one or what else to look for. Any information will help greatly!