Little things like plugs, wires and the like can make a big difference, not necessarily in improved performance, but at least in getting the most out of what you have. I've put replacement or upgraded plugs, wires, cap & rotor and coil in my 3.8, and while I'm sure they didn't really add any HP, that engine probably runs as well now as it did when it rolled off the assembly line.
Just as 1989LX said, if you have a lot of miles on this car, it wouldn't be a bad idea to replace these even if you don't think they're the direct source of the problem. The cap & rotor and coil you can easily do yourself (heck, even I managed those myself LOL), the plugs and wires are do-able if you have lots of time and band-aids
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Personally, I just pay my mechanic to do the dirty work for me
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Just as 1989LX said, if you have a lot of miles on this car, it wouldn't be a bad idea to replace these even if you don't think they're the direct source of the problem. The cap & rotor and coil you can easily do yourself (heck, even I managed those myself LOL), the plugs and wires are do-able if you have lots of time and band-aids
Personally, I just pay my mechanic to do the dirty work for me
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