Changing the ecm on that car should take less then a half hour. Its the box on the inner fender behind the battery. It looks about like this
http://partimages2.genpt.com/partimages/808744.jpg. You might have to get it programmed to your car before it will work though. Looks like its about $170 at napa, and they list 2 diff ones. You can get a replacement at a junkyard for less, and it may not require programming, but you never know what you are getting for junkyard parts.