the codes it gave you are NOT obdII. OBDII is from 96 up (some 95 cars support it as well, even some 94 cars have the connector but not the codes)
the Modis is pulling codes from the ECU much like a consult does
http://buy1.snapon.com/catalog/item....re&dir=catalog
I used the older MT2500 myself but it does not tell you OBDII codes (which all start with a "P")
any which way, you probably have a vacuum leak somewhere causing the problem.
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96 Green A/T gone
94 Pathfinder POS GONE! | 79 Camaro sold

98 I30t Silver on black A/T gone | 96 Granite Pearl (AKA Purple) A/T gone
92 grey VE A/T gone | 96 I30 Black gone
92 maroon VE A/T gone | 92 white VE M/T gone
92 grey VE A/T gone | 6/84 L24E last of the RWD Maxima gone