everyone should have a manual for their vehicle, and the library should have a professional shop manual available in the REFERENCE section...make copies of the right sections...good luck :)
It's a NexIQ scanner with Snap-On case.. yes, it'll read and display DTCs.
If you want the OBD codes, try this site: http://autorepair.about.com/library/ts/obd-i/bl-dtcs-63a.htm?once=true&
You can check trouble codes by turning the key on, off, on, off, on. Then watch the Check engine light and count the flashes. Check this link for codes and more info: http://autorepair.about.com/library/ts/obd-i/bl-dtcs-55a.htm?once=true&
U codes should be addressed first. They are communication codes that could affect effective programming.
Because there's an intermittent issue which needs to be addressed. You need to have the DTCs (fault codes) read to find out which codes you have, what your active codes are, what your inactive codes are, and how many counts of each fault you have.
Troublcodes.net Trouble Codes OBD & OBD2 Trouble Codes and Technical info & Tool Store. By BAT Auto Technical
Diagnostic Trouble Codes.
Go to the following web site:http://autorepair.about.com/library/ts/obd-i/bl-dtcs-41.htm
ecm2900
Trouble code PO151
Assuming there are no DTCs (diagnostic trouble codes) I would go back to basic tune-up procedures like spark plugs, ignition wires, distributor cap, distributor rotor and base timing. A check for vacuum leaks also.
There are hundreds, if not thousands of possible codes.