emission control causing rough idle?

Matter of fact, the incident I referred to happened in the auto shop I took auto mechanics in when I was in high school. The guy was using carburetor cleaner, and we figured it hit a plug wire that was bad.....but nuthing was left under the hood so we couldn't tell. BUT, it lit the spray out of the can and went all the way TO the can and it exploded in the boy's hand. Carburetor cleaner is more combustible than gasoline under the right (or wrong) circumstances.....and I guess those were them. I still see him every now and then because he lives local. You can still tell somethin happened and that was in the real earlies 80s. It was unfortunate to say the least. WD40 is even more combustible than gasoline.