1992 Toyota Camry RUNS ROUGH

Car started running rough out of the blue. Thought it was bad gas. No one else had water in gas I was told. I replaced the plugs with bosch doublel platnum 2's.
Car ran great for 2-5 miles and then it was worse than ever. Was told by one mechanic and also read on a blog somewhere to never use platnum plugs on aluminum block engine, or at least not bosch platnums. So I removed the wires to change plugs with denso's and found two of the four plug-wire boots burned through @ base where it fits down on plug connector. So it's arching over to block. Also 2 of the 4 plugs are sooted up bad or carboned up bad and the other two look ok. There also is some oil on the outside of plugs. Could that be a blown head gasket too?
After I put the dendo copper (regular) plugs in there it runs ok, but I know I have to replace the wires too.
I read in another question on this site that I may need to check the exhaust return thing (what's the initials) and the IRG or whatever too.I did not pay attention to which plugs come off of wires that were burned out on their sides. Would those be the carboned up ones or the cleaner ones or no telling?
What else can I do to solve it myself other than wires, distributor cap and rotor? Will the wires come hooked up to distrib. Cap (that's a new one to me) or separate or is one better than the other?
Thanks a ton,
allen. Science.