long time reader first time post.... I have increased airflow to my es300, (K&N and ported air box). The engine loves the air but at stoplights it can stall out. Is my problem with the timing, mass airflow sensor, computer, or weak fule pump or should i reduce some air flowcloser to stock. It seems like the timing is just a little off, can you adjust this without changing the belt as per dealer suggestion. If anyone has any ideas or suggestions i would apreciate it