I have a question

[lucenti]

at idle for 30 minutes car runs rough then smooths out , then rough again.

been happening for awhile. code 1235 poped up, would any 1 have a ball park idea of what is causing this, or is it the mere fact that idling for 30 min will cause this ..

thank you for your opinions

[justbob]

Have you changed the fuel filter lately? Could be the fuel pump starting to go. If i remember right that code indicates spikes in fuel pressure at the fuel rail.