I don't see how to respond to GreaseMonkey's answer, so I am posting another question.
I removed the connector from the MAP ASSY which I found on top of the intake. I measured the voltage from the yellow/red wire to ground as instructed. I found the full 5 volts. However, I was wondering if this is valid since the check light did not stay on and was acting normal. Should I wait for the check light to stay on again before measuring the voltage? If not, then what is the next step for the troubleshooting process?

Thanks,

-william

You need to perform the K-Test, when the CEL stays on. Your ECM may be in the process of failing, but it hasn't completely failed, yet.