Since the car have 137K miles and been sitting for 6 months, I would suggest doing a complete tune up. I have a 92 Accord EX 2.2 I4 w/ 248K miles that just passed MD emission test last week. You should easily pass the test if you perform the additional items below.

* oil change
* flush, drain & replace coolant
* flush, drain & replace ATF
* replace fuil filter
* replace plug wires
* clean fuel system
* oxygen sensor (only one on this car)

Another important suggestion, make sure you run the car for a minimum of 10 highway miles to ensure it reach the proper operating temp before you take it for a test. Good Luck!