So my car started running really rough and the check engine light came on. i jumped A and B on the obd plug and this is what i got (I is for blinks of the light)

I II, I II, I II, III, III, III

i assume I II is for code tewlve but am confused on the III. ive searched and cant really find a good explination. I have found the GM code definitions, just unsure on my codes. thanks for the help

 

you might want to do it again but looks like maybe a code 33 MAF high signal any other codes will follow if not the code 33 will repeat.

 

Code 33 "MAF signal high" is generally caused by an open ground circuit. Use a DVOM to look for voltage on the ground circuits(pins A and B) at the MAF sensor connector, with the sensor connected and key on. You'll need to back probe the connector using a small paper clip. Any voltage on the ground wire means a poor circuit to ground. You'll need to trace B back to the ECM and A back to the rear of the passenger side cylinder head. A test light connected to Batt+ works in place of a DVOM for this test.

Do you have a good service manual, like the HELM's factory shop manual? It will have the trouble tree for all of the codes with the correct tests.