I just purchased a 95 9c1 as a project car. I had a mechanic replace the head gasket, exhaust manifold gasket, and sprak plugs. He told me cylinder #5 had low compression and misfire. The car runs great excluding the misfire. I seafoamed the the the engine a couple of days ago. I changed the the oil(10w30) and plugs (Champion)again today. When I looked at the cylinder #5 plug, it seem to have of bunch of carbon buildup on it. Which mean the injector works but the gas isn't being combust...Right? The car isn't bad on gas, that's why suspected the injector. I'd appreciate the help thanks.