Originally Posted by sc315
T2d2 has some good info to add to that it's been awhile since my 400 days but I think you can clean/service your idle air valve pretty easily.
Photon I would check your idle air control valve. There's a good DIY on how to clean that on the forum.
It will help with stalling issues at idle, and it'll be especially noticeable if you have a dirty IACV when the engine is cold, and when you apply loads or remove loads from the drive belt... like AC, or turning the steering wheel at low speeds or a stand-still, or holding down the window up/down button when idling.
OP, I'd do the 12v fuel mod as it's easier, it doesn't sound like it's an IACV problem for you OP, but it's definitely something to check if the problem persists.