TSX running poorly with check engine lit flashing
 

Hi, I have a 2005 tsx that is running like it's on 2 cyl and the check engine lite is flashing. This happened the other nite (cold 10 degrees) after stopping at the store and restarting it. When we got home (1 mile) the exhaust stunk. The car has 117,000 miles, so I changed the plugs (all but one was very white) and this didn't change anything. I can't take it anywhere to get the code read, because I don't want to ruin the converter. Any thoughts? Thanks.