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Suspect a bad coil or failed engine computer.
your coil pack might be going bad
The coil packs are attached to the plug wires. Coil packs are interchangable so when I suspect a bad one, I switch the one next to it to see if the problem moves to the other two cylinders. You can also use a inexpensive spark plug tester that clips on to the wire to see how the coil pack is firing thru the plug wire.
on my tach, the green wire connects to the neg on the ign coil pack
the red one