Spark plug Champion or OEM Mazda

Ours has been pretty reliable, had some issues with odd stalling once which was cured with new plugs/wires/carbon cleaning, rear shocks just went recently.

Replace those plugs with nothing other than the Champion 7989 plugs. They are about $14 each and they are a 1 piece design.

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

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.

Champion plugs are barely adequate for a lawnmower...

Champions are crap.

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