Just got an 89 Sub with a 454 and the TH400. The thing is in great condition, with 88K on it. I noticed the other day that when the a/c is on, the engine has an abnormally high rev. You don't notice it much above 20-30mph, but when you are braking and get back down to first gear it feels like your foot is still on the accelerator. Any ideas as to what is going on? Thanks in advance!