A few days ago, my Honda Accord 1998 V6 EX's "check engine" light came on. Since then, the engine experiences instability during idle. At stop lights, I can hear the engine having trouble stay running -- it sounds like as if it would stall at any moment.
To diagnose the problem, I bought an On-board Diagnostics (OBD-II) scanner and extracted the trouble code: P0108 (Description: MAP Pressure Circuit High Input).
After doing some research, here's what I've found:
Certain more advanced scan tools (not the one I bought) can display real-time MAP pressure readings from the ECM (engine control module) and this reading can be used to determine whether or not there's a vacuum leak, loose wiring, or defective MAP sensor.
Without the scan tool, one can use a multimeter and hand-held vacuum pump/gauge to determine whether or not the MAP sensor is defective.
For #1, I don't know which scan tool is able to do this and for #2, I don't know how to use a multi-meter.
Am I on the right track?
What can I do to diagnose/fix this problem?