There are two ways:
First, you can lightly tap it with a screwdriver while idling. If it stalls, stumbles, or generally doesn't like it, then you have a bad MAF. If not, then it might be good.
Second, you replace with another one.
Sorry, but unless you have a high dollar scope, and know how to use it, then that is it.
Actually, 2 and a half ways. Some people unplug it and see if it idles better, but I don't think that you can accomplish much doing that. Also, that will only help diagnose it if you are having trouble with it running at idle.
One other thing to check: You said that you replaced the ignition module, but did you check/replace the coil pack? I still think it is the MAF, but if you have a coil pack handy, you could rule that out.
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Brian
Keep it shiny side up, but show them your dirty side once in a while.
11.3@123mph on 195/75/14" whitewalls. Yes, 195s!
11.2 on the big giant slicks. What's the point? Maybe I'll go back to the whitewalls. They are lighter and have less rolling resistance.
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