My wifes 2000 LeSabre (3.8 v6) has a wierdly intermittent misfire.
Sometimes it has miisfired like crazy for 5 minutes when started, then
wont misfire again for a week. Sometimes it has not misfired in 2
weeks then will misfire slightly whist cruising up a slight incline on
the expressway with a very slight amount of gas. If it is driven
gently it seems to misfire more than when it is driven hard.
I replaced the plugs and wires because it had 70k miles on it and this
did not fix it. The old plugs came out looking perfect btw.
The misfire will set the check engine light, but the next day it goes
out when the misfire dissapears.
I was going to get a scan cable and software from
http://www.obd-2.com/ and plug it into a lap top and run around for a
week or two.
Anyone have any experience with http://www.obd-2.com/ hardware and
Also, any one any experience on what such an intermittent problem
Thanks for any help.