My check engine light is blinking when I go up hills. I have replace the spark plugs and the coil packs.

Hello, a blinking check engine light indicates an engine misfire. If you are certain that you've installed new, good spark plugs properly as well as the coils -- then additional testing is needed, such as with the fuel system and the base engine -- perform a compression test and cylinder leak down test. Hands on testing with a high quality diagnostic tool for use with Lexus products is needed. www.repairpal.com/repair-shops