Ignition coil most likely. I have done many dozens of them. Takes about 2 minutes to replace.
I recently got Denso (OEM) from my local o’reillys cheaper than the dealer (~$80).
Bro ABSOLUTELY do the spark plugs yourself. I bought oem Denso spark plugs from Napa Auto for about $180. Then all you need is a spark plug socket w/ swivel head, 10mm socket, 12mm, a couple extensions, needle nose pliers, dielectric grease, and a pick to make life easier.
Denso iridium spark plugs
New Denso Platinum spark plugs. Car drives great, no codes, no sputtering or stalling or hesitation.
Fitting a decent set (Denso or NGK) of iridium plugs is also worthwhile.
Swapped the NGKs (around 60k miles on them) for new OEM Denso plugs. That stopped the shaking for about two days, then it came back.
I already replaced the spark plugs with the Denso ones I listed though... Is this bad?
A regional tire store / repair center "recommend" spark plugs on my Sienna at 92K for $850 (intake manifold has to come off to get at 3 of the plugs). I asked them what benefit would there be in replacing spark plugs at 92K considering Toyota sets the spark plug replacement at 120K.
I’ve had several Denso plugs do this on a couple Camrys I service, and our own. All 2.4 cars. Caused tow ins for both husband and wife’s cars. I’ve fired denso as a spark plug provider, too many failures.
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If choosing spark plug across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare spark plug across these categories:
In March 2026 on PartReview, spark plug Denso and OEM Toyota were roughly equal.
In March 2026 on PartReview, spark plug Denso were overall more popular than OEM Toyota.
By vote balance, spark plug Denso surpassed OEM Toyota:
By number of reviews, spark plug Denso surpassed OEM Toyota:
In March 2026, according to PartReview, spark plug OEM Toyota led more car-specific ratings than Denso:
OEM Toyota are chosen by owners of cars such as: Toyota Corolla, Toyota Camry, and others.
Spark plug Denso have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of spark plug OEM Toyota with: NGK, Bosch, Autolite, Champion, AC DELCO, BRISK, OEM Volkswagen, Motorcraft, OEM FORD, OEM BMW.
Also available: comparisons of spark plug Denso with: NGK, Bosch, Autolite, Champion, AC DELCO, BRISK, OEM Volkswagen, Motorcraft, OEM FORD, OEM BMW.
You can also see who is better among other spark plug manufacturers: Bosch or NGK, NGK or Denso, NGK or Autolite, NGK or Champion, NGK or AC DELCO.
