I know my engine stumbles every so often, but I just take that as normal. There is also a slight knock but nothing larger nore really noticable. I had just finished sealing up my exhaust so now there should be NOOOO leaks. I also cleaned the underside of the the engine. I was maybe wondering if something wasnt firing correctly so I started making sure all the plugs were on all the way, they were, but when I came to the number 6 cylinder, on the spark plug it felt like a knock or a slight bump, but only on that one. When I would press on it, the knock would stop. Not a whole lot of pressure, but just enough. Now I am letting it cool a little bit before I take the spark plug out to check on it, but could it just maybe be a little loose? It only did it when I just had my finger there but a little pressure would make it stop. Any and all info would be greatly appreicated. 
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