Before you pick up a tool, read the codes. Duh.
There's no reason to guess when you have datastream and code history data to help pinpoint the fault.
You can read generic engine codes for free. Just turn the ignition key from off to on 3 times quickly, ending in the on position.
The codes will read on the odometer.
Misire codes for plugs/wires will read as P0300, P0301, etc...
Don't start throwing parts at it without any diagnostics.
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