Car jerks and misfires?

2018 TOYOTA COROLLA
54,000 MILES • 1.6L • 2WD • AUTOMATIC
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MHPAUTOS
  • CAR REPAIR CONTRIBUTOR
  • 31,937 POSTS
A coil can only be tested correctly with an oscilloscope while under load, this can be done with a live data scanner. The spark plugs should be replaced at 20,000 Km for standard or 100,000 for iridium, iridium plugs cant be cleaned or re gapped and they have a pointy centre electrode, standard plugs are cheap so replace if in doubt.
Dec 26, 2020 at 2:52 PM (Merged)
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JTWINSFAN1
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I know it's not the tires. When accelerating, the car is hesitating slightly and does so while laying off the gas but only on lower speeds. On the highway is doesn't do this and it's doesn't do it each and every time I accelerate but it has become more frequent. Tires are newer and I'm positive that's not the answer. My bad for using bumpy.
Dec 26, 2020 at 2:52 PM (Merged)
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MHPAUTOS
  • CAR REPAIR CONTRIBUTOR
  • 31,937 POSTS
Check the tune related items, sounds like a misfire.
Dec 26, 2020 at 2:52 PM (Merged)