Spark plug Denso or AC DELCO

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?

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.

I wish my Toyota 4Runner spark plug service was that cheap in the Toyota dealer. I was quoted $800 parts + labor for OEM Denso.