You can take them out and get them tested for free at some auto parts
stores. Most will have a tester to confirm they are bad when applying for
a replacement under warranty. I wrote up my experience with one at
www.ncf.ca/~ag384/top.htm and click on "cars". I got a lot of advice here
which will be in the archives somewhere.

Sorry guys gave you the wrong info. My pickup uses electronic ignition.