Lexus Troubleshooting Questions? Ask a Lexus Expert
Can you explain the shudder? Do the rpm's change?
Yes, a little. How long have you had it? Do you know the condition of the spark plugs to start with?
Ok, do you have a scan tool to check for codes? Or to read live data to check for misfires?
That might get you a place to start, but you might need more than that to see the whole picture of the problem.
I suspect something with the ignition system. spark plugs, coil, or maybe an injector
I doubt the transmission. It may feel like the transmission and many people start there, but with everything computer controlled it will feel like transmission if the vehicle is putting out too little power because of an engine issue. I hope this helps.
Please let me know what codes you find.
That is unlikely.