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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.
For best results use champion oe plugs.copper core plugs run hotter have an 06 myself i put platinum plugs in and the car run like S@#t.Spark plug gap should be .44-.48
There were 3 engine in this year, u don't give which u have so here are all three gaps
2.5 Liter SOHC GAP=0.044"
2.4 Liter DOHC GAP =0.050"
2.0 Liter SOHC GAP=0.035"
I have a 2001 Stratus with the 2.7L V6. From what I understand, the engine compartments are very similar. When I change the rear spark plugs, I have found that I need to use a spark plug socket on a 6" extension, with an elbow socket. There isn't enough space in the engine bay to get straight over the spark plugs, and I have yet to find an easier way than simply using a elbow socket.
When installing new spark plugs, it's always a good idea to use a small amount of anti-seize on the threads.
Spark plugs are under where the thick plug wires are, or each plug has it's own coil on top of it. A coil is a thick brick like box.
If you need to ask , maybe you should be changing them yourself.
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
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