Yesterday I was on a trip with my car which has been running great. A 1992
olds 88 with 132,000 miles. My cruise control went out, the car shifted
out of overdrive and would not shift back. I pulled off to check the
transmission fluid but that was fine. When I started again out again, it
had a terrible time shifting and the engine was reving up and down -
especially while idelling. I had to continue on my trip so I took it
easy. The next day the car ran fine. Is this a computer problem? If so,
can I replace this part without special tools and/or calabration?