It is pretty easy to change spark plugs on most cars. Buy a Haynes manual at an auto parts store; it will walk you though it step-by-step. The gap should be listed on a sticker either by the radiator or the underside of the hood. It is usually possible to by pre-gapped spark plugs, but you should still check them.
For the 1.8t engine -> It is not too hard. Just take off the plastic cover, undo the Allen bolts around the square things, pull out the long plastic tube thing and use a spark plug socket. The gap is .028. I had the guy at the auto parts store gap the new spark plugs.
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To change spark plugs on a 5.9 2002 Dodge Ram 1500, locate the old spark plugs. These are located at the end of the 8 wires inside the vehicle's bonnet. Remove the old spark plugs and replace with new.
60,000miles
If you have platinum spark plugs, 100K. If you have standard plugs, 50K.
Generally I change platinum plugs at 100K and regular plugs at 50K.
Take it to the dealer.