Once started the engine goes into very high idle(3000-3500 rpm), service engine soon light comes on. After 5-10 min at high rpm service light goes out and car resumes normal idle.
This should be a drive by wire vehicle meaning it has a cable for the throttle body. First thing would be to see if any error codes can be pulled up (most parts stores will do that for free.) Drive by wire versus the late model that use electronic control for the idle have a IAC or idle air control which when first started controls the idle air intake--all air is run by it to idle the vehicle when cold--
Usual symptoms are rather high idle when cold engine or even idle and RPM jumping up and down and stalling when cold.
Another way if idle does drop when cold is tapping the gas--engine will still run until hot. Means not usually a fuel pump issue.
You could also have if the vehicle is fuel injected a dirty Mass air flow sensor, a throttle position sensor, etc.
These can be if the vehicle has them cleaned using a special zero residue spray cleaner.
First have it scanned to see what if any errors it shows--the computer.
your description of drive-by-wire is not correct, it is for the traditional cable-linkage type.
drive-by wire has a pedal sensor that sends signal to the ecm which in turn signal a motor to operate the throttle plate.
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