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It could be the AFM. Out of curiosity, I unplugged mine and tried starting my 4Runner to see what would happen. It starts up and runs for a few seconds, then dies as you have described. I don't know how to test it, but if you get the wiring diagram for it you should be able to figure it out. You could have a bad connection, or broken wire between the AFM and the computer too.

Here's another idea. I got water in my computer and my 4Runner would start and run really bad for a short period of time then die. Each time I tried starting it it ran for a shorter and shorter period of time until finally it wouldn;t start at all unless I let it sit for a while. I dried the computer out and it worked fine.

Have you checked your codes?


Well I have a basic diagram for testing resistance values of the AFM, but unsure if the pins are numbered 1-7 from driver to passenger side, or opposite, or whether they're not even sequential?

Very interesting on your same results with AFM unplugged.
Unfortunately I don't have a manual.

As for the water possibility....the truck has been sitting for a few weeks, so would assume the computer is plenty dry if that was the original problem.

One other thing I should mention....I've removed the EFI fuse for a few mintues to reset that.

How do I check the codes?