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Portola Valley, CA
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.
Yes, your local tire guy can get them off. Just use the same chrome acorn lug nuts that are on the vehicle to replace lock nuts.
Did you disconnect or let the battery go dead? Your throttle body (blade inside) is probably cakes up with sludge...Clean with toothbrush and carb cleaner... Computer will relearn idle
His "off the cuff" response is 100% correct. 15K oil changes cakes sludge inside the engine, also restricting oil passages. Try http://www.lucasoil.com/products/display_products.sd?iid=49&catid=7&loc=show&headTitle= - Lucas Synthetic Oil Stabilizer with some fresh oil
The car does NOT have a cold start valve