My car sometimes stalls on idle or when slowing down...I've seen a few threads on this already, and have already eliminated fuel filter, Throttle body, vacuum leaks.

I would like to test the following components to see if they need replacing:
- IAC
- TPS
- MAFS

Anyone can tell me how to test the following components? I took off the IAC and tried spraying it with WD-40 (only thing I had around). It did clean it a bit, but problem still exists.

I took out the Mass Air Flow Sensor and only inspected it. I was not sure how to clean eat. I also tested the connectors and there were some resistance on them, but don't know what values are normal.

Anyone know how to test these parts, or has recommendations on what else to look at?