How do you replace spark plugs and wires on 2002 Chevrolet Tahoe?

whatever you do, REPLACE ONE AT A TIME! The wires are connected to the plugs in a certain order. If you pull all the wires off then you will need to get the wiring order to make sure you get the right plug to the right wire. Gently pull ONE plug wire off, twist it BUT do NOT yank on it. If they have been on there a long time, they tend to bond themselves to the plug. twisting usually can break them loose. There is a spark plug wire removal tool that grips the plug at the base if they won't some off. Once you get the wire off the plug, follow the wire up to the distributor, and remove the wire from the distributor and insert the new wire and loop it where the old one was. You will need a socket and ratchet to remove the spark plugs. Get a deep well socket and they actually make spark plug sockets.......I am not sure what size you need. Place the socket over the plug and ratchet it to the left to loosen. Be sure to have the socket securly on the plug, pr you could break the plug off. Once you loosen the plug simply unscrew it from the plug hole. Now take a new plug that has been gapped correctly. Check to see what the gap is for your type of plug. The plug must be gapped correctly to get it to fire correctly. You can buy plug gapping tools or feeler gauges. SOme are .35 some are .40 and some are 50. Know yours before you start, some come pregapped from the factory but I always recheck them using a gauge. Place some anti seize on the threads of the plug and START THE PLUG IN THE HOLE BY HAND.............. Do not place the plug in the ratchet and socket and try to fidn the hole. If you cross thread the hole, you will need to have it retapped before you can get the plug back in. Once you have the plug started by hand use the socket to continue to screw the plug into the hole, and then place the ratchett on it and tighten it but NOT TOO TIGHT! I would say snug and then just a bit more. Get some spark plug wire lubricant and smear it on the the inside of the wire boot that goes over th ehead of the plug. You can use dilectric grease as well............ and as you push down on the wire you should feel it sort of click or snap onto the top of the plug. That's one down...........now go to tanother and repeat. Biggest thing to remember is: Remove one wire and plug at a time Do not yank on the plug wires to get them off the plugs Make sure you get the socket on the plug squarely to remove it Maje sure your new plugs are gapped properly Use anti seize on your new plugs on the threads START the new plugs by hand Snug the plugs up do not overtighten Use spark plug wire grease or lubricant or dilectric grease Good luck