The front plugs foul often on these. I've been through about 4 sets.
If you only replaced the rear, I'd pull em both and look at them. It takes 15 minutes when you get the gang of it.
The trick is an extension on your plug socket, and a rubber hose to get the plug threaded once you're done.
Taking off the left side scoop makes it easier to get to the front plug. Allows you to stick a hand in from underneath to guide your socket wrench.
If you need any info, let me know. I have the shop manual at home. I could even look at the trouble shooting section when I get home if you like.
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