I have the same problem on an Oldsmobile 96 Cutlass Ciera SL. Just put $1,400 in it to pass inspection, and when I drove it home, I found that I had the same problems you mentioned.
Engine racing when it should idle, then dropping to low levels almost to the point of a chug. Acceleration problems (very inconsistent. Sometimes it'd accelerate ok, other times it's very slow. Twice it stopped accelerating altogether while going around 30MPH).
The problem has gotten worse. My friend and I tampered with a couple things, and then it started stalling. Now, it won't start at all!
We just replaced the mass airflow sensor and MAP sensor, and it still won't start. Yesterday, it'd start and run, but would stall out. One time it stalled out it wouldn't start back up for a couple minutes. Now, today, it won't start at all. :-(
Any ideas? Feel free to e-mail me directly if you figure anything out. I'm getting desperate.
E-mail: compudyne23-carpros AT yahoo DOT com
Sunday, July 1st, 2007 AT 3:27 PM