Initially it started to idol rough. Checked the error code and was a spark plug miss fire at 3. Decided it would be best to replace both coil packs and all six spark plugs. When I pulled up the coil pack the spark plugs were full of oil on both sides. So I figured valve cover gasket. Replaced those and cleaned the oil up as much as possible. Put everything back together. Started car and it won’t stay running without giving it gas and it sounds like air is leaking somewhere. I think it is coming from the black part on top of the intake manifold. However I am not sure. What are my next steps...i had to disconnect the gas line and and some antifreeze leaked out. Could air in the system cause this? Obviously I am not a mechanic. Just trying to fix my favorite car without the large bill.