So my parent's have a 96 Monte Carlo. Well we have been having a couple of probs with it lately. When you accelerate it will take a second or 2 to shift into gear. Usually it shifts into gear around 2K but has been going up to 3k or a little higher and then when it shifts the rpms will go back down where they should be. It only does this here and there. Also it only does this in 1st gear all the other gears are fine. Any ideas ?