roundel

Hey guys, whats going on. My name is Lee, I'm new to the infiniti scene, i own a 1990 bmw 535i, but my mom has a 97 I30. Recently the I30 has been having some problems. First off, recently when i was on the highway the top molding piece for the sunroof broke off and the rubber molding is now falling off. The sunroof is also a little rusted i plan on cleaning that up this weekend but i'm wondering if this is a common problem and if there are any tricks to fixing it and where is the best place to buy new moldings? Secondly it's auto obviously and when it is cold out and the car is cold u'r not able to change gears because the car just stalls out immediately. You have to let it warm up to half on the temp guage. If you get it to move when it's cold the car doesn't want to change gears, can't decide what gear it's in or doesn't down shift and stalls the car. We have had the tranny checked by many different people including the dealer and a reputable tranny shop in the area and neither can figure out the problem. Any clues on what it could be. Thanks guys.