Wires look to be brand new motor craft. And there is no stumble when driving or jumping on it. Just at idle. And does not happen when car is coldCheck plug wires
Timing was at 8° when the stumble was noticed. Timing is now at 12° it's a little more noticeable.I've had similar symptoms when my base engine timing was just a little too advanced. And when I used a (don't get me started) MSD coil and wires. When I put those in the trash everything improved significantly.
The checklist above is great of course.
Thank you I'll try this laterA cylinder balance test can help you pinpoint if your problem is limited to just one or two cylinders. After the KOEO test, stomp the gas-pedal and it'll kick into cylinder balance. It will flash out the problem cylinders. Could be mechanical, electrical, or fuel-related, but this can help pinpoint. It won't help if you have a more general problem (fuel pressure, tune, timing, vacuum leak, etc.).
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