Trouble at Idle... Help please

Hope it helps

 

Not a mention of any electrical testing in this thread. Sigh.
With key-on-engine-off you should be seeing the 5 volt reference signal from the PCM as well as power and ground. I unplugged the MAF and here is what I read on each pin on the connector.

1. red/white = 12v (battery power)
2. black/white = ground
3. green = ground
4. yellow/green = 4.9v
5. blue/black - ground

I recommend using a test light on 1,2,3,5 and a multimeter on pin 4. Once you get those readings you can go from there.

 

Hey. Check out this photo I've attached. Someone had the same issue with a 97 taco. Dirty/ bad crankshaft sensor. See if that gets you anywhere.