The 1988 Chevy Cavalier spark plug wires are quite easy to remove. The spark plug wires simply pull off on each end. Put the new spark light wires on by pushing downward on each end.
123456 is the firing order ...or, just call a dealer. They will tell you.
I'm not sure what the firing order for that vehicle is but try Autozone.com they are posting tech data on their web site now. If you plan on doing plugs and wires just do one at a time, then you should'nt need the firing order.
Look [http://autorepair.about.com/od/enginefiringorders1/Engine_Firing_Orders.htm Here for your Answer]
The spark plug order for your 1988 Nissan Pathfinder V-6 engine is; one Êsix Êtwo Êfive Êthree Êfour. Your engine will run very rough if the spark plug wires are not connected in the proper order.
They are screwed into the cylinder head, at the end of the plug wires.
Pull the wires out of the top of the motor, they have a long plastic boot on the end of the wire. Using a spark plug socket and a long extension you will be able to remove the spark plugs. Check the gap on your new plugs and I like to use a section of hose that fits on the top of the spark plug to to thread the plug back in. That way you reduce the chance of cross threading. Once you get them started you can tighten them down. I usually replace the wires when I replace the plugs. I would suggest replacing the plugs/wires one at a time to reduce the risk of mixing the wires up.
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Follow the spark plug wires to the rear of the engine and you will find the coil packs.
Backfire is normally caused by engine out of time, or spark plug wires installed incorrectly.
The big coil pack goes to the top, the front rotor is number one. they are usually labeled on the block with a L and a T. That stands for leading and trailing. Hope this helps.
Replace the spark plug wires, to much resistance.