Originally posted by rozwell911:
Could be a precat, a bad o2 sensor messing with your air fuel ratio....then again youd be pulling a CEL . And there was no word of a CEL in your post...make sure yous spark pulg wires are good...could also be some folwed spark pulgs....start with the simp things, like what you changed...then go from there.


Roz


In fact I had two consecutive CELs 6 months ago, bad o2 sensor, chagned both upstream and no CEL neither codes in the memory, I use to check it often with the ODB explorer,
When i checked the bosh after 3k miles they were like new,
I'll check the autolites in the weekend.

1998 Contour V6 2.5L ATX