A misfire condition and its corresponding misfire trouble code can be the result one of many different components having failed... that troubleshooting its cause can seem almost impossible. For example, the misfire code could be caused by a bad Coil-on-Plug (COP) ignition coil, or a bad fuel injector, or in one engine cylinder having very low compression, and the list could go on...
According to Spam's website, the canned meat contains only 6 ingredients: already-cooked pork (two different cuts: pork shoulder and ham), salt, water, potato starch (to keep the meat moist), sugar and sodium nitrite (a common preservative).
Not much difference if you're talking about standard chopped animal parts and fat lunch meat. You can get incredibly high quality lunch meat that's very lean these days that's not nearly as bad for you as Spam. The salt content can still be quite high. You are entitled to a copy of the ingredients of items in your store deli.