Check under the hood for vacuum hoses that are detached or cracked, most
likely that will be your culprit

Check what Jason said, then unplug the airmass meter. If it runs better that
is probally the problem.

Classic symptom of a failed air mass meter.

With the ignition OFF, unplugt the Air Mass sensor. It is in the big plastic
tube between the Air cleaner and intake. There is a release you need to
squeeze.

If the car then starts and idles, the problem is in the air mass sensor or it's
wiring. You can drive it in "Limp Home" with the AMS disconnected but it has NO
power,  Sometimes cleaning the plug contacts works. But it is usually the
sensor.  There are much better prices on line than what the dealer wants.

I wish I had known that when I limped to the dealer and emptied my checking
account. Lack of an Air Mass sensor is also the reason I like my 94 940s with
Regina injection.

Al

Had
79 245 D,
81 240 D,
86 240 320,000mi and running fine when traded
94 944 Green 257,503 mi CRUNCH Parted out
Have
94 944 White 149,000 The New one
94 944 Maroon 135,000 mi