First check the plugs. Pull the #6 plug and look at the electrode. If it's wet and/or dark (black) it's probably not firing correctly. What is the spark plug gap? Is the center electrode eroded (not flat on the end)? Swap in another plug and see if it makes any difference. How old are the plugs?
Second, check the wires. Did you replace the wire(s) when you changed the coil pack? They should be replaced periodically (I replace the wires on my '96 4Runner at about 100k miles). Check the wires with an ohmeter. Resistance should be around 16-17.5k ohms (depends on length).
FYI, each coil pack on your vehicle fires two spark plugs. The #6 spark plug is fired by the #3 cylinder coil pack, so if the coil pack were bad, most likely both the #3 and the #6 plugs would not fire.
Newer vehicles, including yours are made with 100K plugs. This means unless you have issues with them they dont require replacing before you exceed 100K miles on the vehicle. If you are having issues with the performance of the engine such as sputtering that leads you to believe its the plugs then after a thorough diagnosis, if you decide to replace them be sure and utilize quality plugs and gap them properly. If you get "specialty" plugs like T3 or tri-tips, etc make sure you get them for your vehicle as they come factory gapped and ready for installation. ALso be sure and replace all plugs at same time.. dont mix and match. Inspect your wires for cracking or glazing as well.
i have run into this problem already at my shop , what we did is make a
special tool ,it was kind of hand , it basically was a rod with a easy
out welded to the tip of the rod . it took about 15 min to come up with
the idea ,and 5 min to get the broken tip out
hello the easy way to do these plugs put your car up on ramps front end only use jack stands under vehicle get a long 18 inch or longest extentions put them together with a swivel socket 5/8 reach from under car you can actually see what your working on from here it seems like its a lot of work but when you see its a lot easier goodluck
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