99seville215 Posted June 30, 2011 Report Share Posted June 30, 2011 i have codes on my 99 caddy seville it stutters at acceleration an while sitting at the light ...i did a onboard diag. an these codes came up p0420 ,p0440 i can fix these myself i guees but i need some direction....B1253 ..an u1255 help please Quote Link to comment Share on other sites More sharing options...
Ranger Posted July 1, 2011 Report Share Posted July 1, 2011 Always post the code definitions along with the codes. No one has them memorized. How old are the plugs and wires? Quote Link to comment Share on other sites More sharing options...
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