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2013 Lexus IS250C Rough idle

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2013 Lexus IS250c, 101,000 miles

The car started running rough at idle, slight shaking. It seems like a misfire

My mechanic changed the spark plugs and coils and the problem persists. 

I have run several tanks of gas through it and have added injector cleaner, gas dry, etc. 

What are we missing?

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2 Answers
4

Are there currently any codes, or have there been any codes indicating misfires, or did your mechanic just guess and load the parts cannon?

 

3

You need to start with checking the live data (fuel trims, oxygen sensors reading, MAF sensor).

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