Hey guys. I've been having an issue regarding coolant in my engine. When I remove my spark plug caps I find coolant. My check engine light came on the other day and I had it tested and it said I had a misfire in my 4th cylinder. I checked out the thermostat housing unit and everything looks good there. I actually changed it about 2 years ago due to it cracking. Just seeing if anyone has any suggestions for alternative causes because I'd love to avoid changing the head gasket. I haven't had any other issues besides this. No smoke or steam like I've read others have had, no overheating, etc. Thanks!