IET valve

[justincblades]

What and where is this located on my 2003 f200?

[boscoe99]

What does IET stand for?

If the I is for Idle maybe you are talking about the idle air control valve aka idle speed control valve. If so, see item 17 in the illustration below:

2003 F200TXRB Yamaha Outboard THROTTLE BODY ASSY 2 Diagram and Parts