hey all, i'm chasing a small misfire on my 350. its fluttering on both banks of the engine. i tried changing all ignition components with known good ones, and flushed and steamed the gas tank. this engine is out of an 88 iroc but i slid it into my cadillac and used tbi injection on it. right now i have ac plugs in it (new ones) cr43ts if memory serves correct. i looked at the listing for an 88 iroc and it comes up with a different plug number. is there any difference between these plugs and could this be the cause of my misfire?