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I believe the factory originals are champion brand, and would have been platinum, but it should still run decent with the coppers. The only thing I can think of is they are of the wrong gap. Copper plugs do not come pre- gapped at all and need to be done by installer. The gap for your stratus, if it's a 4 cylinder is .050. Wrong gap will cause no power and shaking. Correct champion number in copper is #443, and should say that on the box/plug.
Instead of explaining it, Go to Youtube and type in how to change spark plugs. This will give you a view and pictures. When you purchase your new plugs be sure to have your auto info such as year , make , model , engine size. Plus ask them what is the GAP measurement. They do sell plugs that don't require gap. Plugs, Gap tool, anti-seize grease (small packet) $.99. Whatever you do, don't forget the grease, it keeps your plugs from being welded in the head and alot easier to remove. Good Luck
you need a extion on your wrench that can reach the plugs and if your car is a 2.4 duel over head cam gap plugs at .52 and you can call a local part store and ask them info and they will tell you every thing you need to know.
using a spark plug spanner take each plug out in turncheck the gap on the new one with feeler gauge and install its a good idear to do it one at a time so you wont get the ht leads mixeed up
AutoZone's online specifications page gives this message..."Refer to the underhood emissions label for specific spark plug gap information" They go on to say..."Caution! Gap is not adjustable on certain plug brands"
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