A little while back my car over heated and I had to replace the radiator because it had a hole in it. Well ever since my car has been really boggy. It'll drive fine for about five minutes, then it starts to bog, almost like its misfiring. I'm thinking maybe i fried a spark plug when it over heated, but what do you guys think, and what should i do? it feels like it has a total loss of power, i had the compression tested and its fine, also no smoke or anything is coming outta the exhaust. but when it does start to bog it sorta smells a little rich. any help is appreciated, thanks.