2004 Mitsumishi Endeavor

What engine

The gap should be 0.028-0.031 in. (0.7-0.8mm) and are set at the factory. These are iridium plugs and so not really adjustable. Check and if within specs, they are good.

Here it is.

Sounds like your fuel filter is giving you early warning that its time to replace. The big question- when was last healthy tune up? All filters, plugs etc...

YOU NEED LONG SPARK PLUG SOCKET. NEED A 3/8 INCH RATCHET WRENCH.YOU NEED EXTENSION.YOU NEED SPARK GAUGE YOU NEED A TORQUE WRENCH. NOT MANDATORY JUST DONT OVER TIGHTEN SPARK PLUGS STRIP ALUMINUM THREADS WAIT UNTIL ENGINE COOL TO KEEP FROM WARPING THE HEADS. SPARK PLUGS LOCATION ON TOP OF CYLINDER HEADS.TO GET TO SPARK PLUGS THE COILS ON TOP EACH SPARK PLUG.HAS TO BE REMOVED BY REMOVING SMALL SCREW.THAT HOLD COILS DOWN.AND CHANGE ONE SPARK PLUG AT A TIME SO YOU WONT GET THEM MIXED UP.GAP PLUGS AT 0.028 - 0.031

Remove the upper intake manifold. Good luck.

IT IS IN BEHIND THE GLOVE COMPARTMENT YOU HAVE TO TAKE IT OUT BY UNSREWING AND START FROM YOUR RIGHT SIDE

To get to the rear spark plugs you have to remove the intake plentum (Black plactic piece on top of motor)

you have to take the plenum off. the big plastic thing on top of the engine.