[spinne1]

If by ECM you mean the car's computer, it is a pretty easy fix. You first get one from a boneyard (or buy one from a parts store), then remove the black plastic shield below the dash (7mm socket works great, or a torx screwdriver (don't remember the size). Now, look under the dash by the passenger's feet and look for the silver box with the three main wiring harnesses connected to it. It is held it place by a small metal bracket with a single 10mm nut. Remove the nut and the bracket and you can wiggle the computer out. To remove the wiring harnesses, squeeze the plastic on the sides of the harnesses to release the locking mechanisms and pull away from the computer. After the computer is out, use your same torx screwdriver to remove the cover plate on your computer, under which the chip resides that you need to replace with the chip in your car's computer (I think the 94 still uses the replaceable chips rather than requiring a reprogram). Then put the cover back on, stick the computer back where you got it, reconnect the wiring harnesses, and reattach the bracket with the 10mm nut. Then test the car before putting the black shield back on in case you find it doesn't work right or needs further diagnosis.

It's about a 1/2 - 1 hour job.