A couple years ago I replaced my throttle body due to a PO121 error code. The new throttle body fixed the issue until recently. It has only been at the most 2000 miles. I am now getting the same error code again. Upon start up the car goes immediately into limp mode. However if I let it set there and run until it warms up and then turn it off for 10 - 15 seconds everything is good for the rest of the day. If I don't use it again for a week or two same thing all over again. Your thoughts and suggestions or ideas is greatly appreciated. Thanks.