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Do you know if it stores any fault codes? That would be the first thing to check. These engines have a variable valve timing sytem that can cause intemintant issues like you discribe, and moreso with higher mileage engines.
Most commom problem is blend door problems in the front HVAC unit. Will need to have someone familar with those type of repairs to check and see if what your problem is.
Most likely the seat element under the upholstry has a break in it do to wear and tear of sitting in seat. It can be replaced.
You can check with Toyota parts department to make sure but I do not think it will work. I belive you havr to order the latch assembly.
Could be a worn inner c/v axle joint....but do not count on my guess. I reccommend you have someone exsperenced in drivetrain, suspension and steering check your car for you.
Most likely the instrument cluster will need to replaced. Exchange units can be purchaced.
The simple anwser is no unless a noise was evident on a road test. When a bearing fails it can fail rapidly.
Its a chain on a 3.7 liter engine
In my opinion I would replace the wires. Rarely do I see coil problem with GM products so I would leave them be.
I suspect you may have a fuel injector that is leaking....better get that checked asap.