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Wierd engine problem - 3 cylinders come on and off
Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
The wire are ok
We change to new plugs
If the wire were damage why only betwen 1,500 to 2,000 rpm ??
It's something to look at. Troubleshooting involves covering all the possible causes.
Bad wires can cause misfire under load.
The three wires in question travel together. They should be removed, inspected, and checked for resistance.