Well the verdict on this was a bad Oxygen sensor. I suppose it makes sense, since when cold, the computer will ignore the 02 settings. net cost $200.

Since I had to have the repairs done by a licensed MA emissions repair shop, this was worth it.

What kind of multimeter do I need to test emissions components? I have a standard electrical multimeter that can test resistance and voltage, but I hear I need one that can test frequency.

Is this some kind of dumbed down version of a Scope?

Recommendations? Sears sells one that includes a thermocouple
http://www.sears.com/sr/javasr/product.do?vertical=TOOL&pid=03482400000

----
John Turner