My 2003 Mitsubishi Galant (V6) started to hesitate and die. It starts back up fine and will die again when I let off the gas or stop. It will run fine for a couple of months (and a few tanks of gas) and then start the process all over again.

Actually you should try cleaning the one you have before you buy one. Just remove it and use some electrical contact cleaner to clean it up. The stuff at your local parts store is probably Lectra-motive, its in a red spray can.

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Check the idle air control (IAC) motor operation sound.
(1) Check that the engine coolant temperature is 20°C (68°F)
or below.

(2) Check that the operation sound of the IAC motor can be
heard after the ignition is switched to the "ON" position (but
without starting the engine).
• An operation sound is heard.
Q: Did you hear the operation sound?
YES : Clean the throttle valve area Actually you should try cleaning the one you have before you buy one. Just remove it and use some electrical contact cleaner to clean it up. The stuff at your local parts store is probably Lectra-motive, its in a red spray can. ------------------------------------------------------------------ Check the idle air control (IAC) motor operation sound. (1) Check that the engine coolant temperature is 20°C (68°F) or below. (2) Check that the operation sound of the IAC motor can be heard after the ignition is switched to the "ON" position (but without starting the engine). • An operation sound is heard. Q: Did you hear the operation sound? YES : Clean the throttle valve area