"If I SLOWLY increase the speed to 1000 RPM to keep it running vacuum goes to 0 in hg. The engine doesn?t want to go much faster than 1000rpm in Drive/Reverse. If I get on it too quickly it cuts out. It hasn?t got enough power to drive up the driveway. Put it back in park, vacuum returns to 15in hg."
Does the exhaust have a catylitic (sp?) converter? Sounds like its plugged from running so rich. Could have a bad exhaust pipe somewhere too. Seen a few crack inside and then fold over and block the exhaust. If you can, remove the exhaust from where the 2 come into one, ahead of the cat, and give it a try. Just might work.