If you're working on it:
2011 Civic, 142k - check engine light is on and it runs rough sometimes when I first start it.
Once it warms up it usually smooths out.
I already did plugs and looked over a few obvious things.
Part store says the code is P0300, and I’m not sure what to check next.
If someone else is working on it:
2016 Explorer, 122k — it jerks or shakes sometimes when driving. One shop mentioned one possibility, now another is leaning toward the transmission, but the problem comes and goes and the estimate is getting bigger.
I have the estimate and notes from the conversations if that helps.
Looking for a second opinion before I go any farther with it.
Year model mileage - what's going on?
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Advanced Driveability Technician
We’ll work through the issue by text first. If needed, I may call. When complete, the thread and final notes are your written diagnostic review.
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