Sounds like clogged fuel injectors. Try a can of fuel system cleaner and clean your Mass airflow (MAF) sensor. I had good results with Berryman B-12 fuel system or injector cleaner If you've never done this before, that's the most likely culprit. Good practice would be 2 use a can with every oil change or 2x year. And clean your MAF every 30k miles when you change your air filter. They don't teach you this in the owners manual.
01 LS430 149K
04 RX330 AWD 196K
Last edited by LSBen; 06-20-15 at 10:56 PM.