i am having a problem with my automatic transmission after the car has been running about ten minutes the transmission is shifting hard ,the pontiac dealership thinks it a harness but i'm wondering if anyone has had this problem in the past .thanks
All gears or just going from one gear to another. Is it still under warranty. Have a line perssure check done (idle and stall) when the problem is there and compare to the specs. Hopefully the dealership (when they start working on diagnosing the problem) will actually do tests and take measurements rather than assuming what the problem could be.