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Portola Valley, CA
If it is an aftermarket system then yes
You need someone who has a factory scanner. We have the DAS tester and Autologic If you are in Burlingame, I believe Holland Car Care can help.. If not we can http://www.autologic.com/en-us/pages/homeproducts/autologic-solution/mercedes-benz-diagnostics
What is the code on the smog report? It would be POXXX
Have you checked fuel pressure? What is the fuel trim?
Is the "Check Engine" light on when it is running? Common problem is the coolant temp sensor, usually a code is in the system for it.
Vehicle is over-fueling. I would check vacuum hose that goes to the "map sensor"sor Fuel pressure regulator could also be sticking http://images.search.yahoo.com/search/images;_ylt=A0oG7m2S5otRa1UA4MRXNyoA?p=gmc+van+map+sensor&fr=robo&fr2=piv-web
I would suggest replace entire tranaxle...Faster turn around....We use transmission from http://www.hnatrans.com/ for Honda and Acura
Should be in your owner's manual....Is the compressor not turning? Probably out of freon
Try the other key...Could be you immobilizer kicking in..(alarm)
Is the "Check Engine" light on? If it is, is it blinking at times? If it is blinking, that would be an engine misfire. Misfires often feel like erratic shifting.