1. If your check engine light is flashing it means a serious misfire and could cause damage.
2. Check your codes - what codes are coming up?
If you’ve replaced your plugs recently make sure (not platinum ones I hope) they are gapped 0.035.
Have you checked oil for milkyness- blown head gasket can cause misfire.
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Jeep TJ rebuilt 4.0L, Custom Steel Roof Racks, vintage ((Jeep specific)) 15” Centerline Hellcats,
Last edited by Fishframe; 27-05-2021 at 04:03 PM.
Reason: Added info
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