Spark plug Champion or AC DELCO

I did put ac delco factory iridium plugs from rockauto on mine at 100k.

Pretty sure it had original plugs in it, replaced those with some autolites that were on sale, soon to put champion coppers in it though (personal preference).

Try champion part number 7989 it's one solid piece not 2 like motorcraft I've had good luck with them

While I had the coils out, I replaced the plugs (used ACDelco double platinum professional grade, proper gap. No NGKs were available). After I replaced the coils, the misfire code(s) went away for a few days.

Honesty I've just used Champion all year's or whatever less than five bucks and have never ever given me any issues.

going on almost a year on champion $1.99 copper plugs and my car runs just as good if not better than when I had the oem plugs in there...

I too happen to have the champion plugs that iceman has. Happened because Murray's didn't have the dealer only replacement plug and couldn't get them. I had no choice because the stock ones were blacker than my tires. They rev just fine and seem to run just as well. I was told that a long time ago champions were known to become permanantly stuck in the block though. I plan on changing soon just in case that rumor is true.

I have a 1986 blazer and replaced the spark plugs with ac delco factory spark plugs purchased from napa, about 2 months later I was driving the vehicle and the vehicle had a miss then starting blowing out oil from the Pcv vlave from excessively high crank case pressure after electrode fell out.

I do know certain Toyota "sporty" cars run like crap on Champions.

STAY AWAY FROM CHAMPION SPARK PLUGS they tend to have a insulator cracking problem