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Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.
The fuel cap is unrelated. This sounds like you have a misfire. You need a scan tool to get the codes. You may just have a faulty coil pack, may have gotten wet and water usually amplifies ignition related problems. I would check for codes and look for misfire codes. This is most likely the problem. You can take it to autozone and get a free engine scan.
Get the codes scanned first, misfire codes are P0301, P0302, etc.
A coil pack is what sends the spark to the spark plug. Replacing a coil pack is easily done as it is on the top of the engine. It involves removing the engine cover to access the coils usually has one 10mm bolt holding it to the valve cover.
Go to the parts store and get a free scan, save this page to favs, and message me when you have this info.
You are welcome, look forward to your reply, thanks.
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