[JimmyKman]

-Sounds similar to my problem: I have a 2000 Neon with a 2.0 and a three-speed automatic trans.The engineloses HP at load, either uphill, on the highway; or during hard accelleration. AC affects this, too. I found good fuel delivery (45PSI at full volume), and good compression, but low vacuum at idle, around 15 inches with the AC on (at idle) and 18 with the AC off. I can watch the vacuum gauge move up and down as I turn the AC on and off. I checked the timing and belt and put a new belt on, though it didn't need one and replaced the plugs but it did not help. I can't run this car up a any kind of grade without downshifting. -Anybody have an idea?