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Pentastar Misfire

guidefreitas

New Member
First Name
Guilherme
Joined
Jun 13, 2026
Threads
1
Messages
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Location
Brazil
Vehicle(s)
Gladiator 2023
Hi! My Gladiator has around 10k miles and it started presenting misfires. I tryed a few shops and a local dealership without success. I'm from Brazil and Gladiators are pretty rare here. - Jscan logs attached.

Conditions:
- Misfires intensify after ~30min drive
- They seems to happen ~2000rpm at normal cruising ~60mph
- They are more intense on cilinders 2, 4 and 6 but also happend on 1, 3 and 5. So both banks are impacted.
- The misfire stops when in traffic

Things I've already done:
- Change spark plugs
- Clean and test the fuel injectors
- Change fuel to 93 octane (25% ethanol) - No change
- There's no obvious air leak

Any ideas are appreciated! Thank you.
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