Sounds like you have lost control pressure regulation in the fuel system. Since it appeared suddenly, I would say you have something going on with the fuel pressure regulator or the seal on the control valve has become damaged or is leaking - among other things. Can you rev the engine? A very rich fuel mixture will ruin the cat before you hurt the O2 sensor. Don't let the cat get too hot - glowing red for very long will do it in. The next time you start it, disconnect the cold start valve - there is already too much fuel in the system - no need to dump more. Let it warm for a few minutes and see if you can rev the engine. A couple of heavy acceleration moves on the throttle valve may dislodge contamination - or make it worse - either way you are closer to solving the problem. If the problem continues, check to see if any fuel is coming out of the fuel pressure regulator vent - none should. Disconnect the vacuum lines on the fuel pressure regulator and see if any fuel is running out - none should. Next take the cold start valve out and check to see if it is leaking when it is suppose to be off. The last thing I can think of right now would be to disconnect the electrical connection on the frequency valve and see if anything changes. To isolate the problem you will probably need to put the fuel gauge and system diagnosis tool on. It gets more complicated from this point. Harold McElraft - 3354 --- In dmcnews@xxxxxxxxxxxxxxx, "Lee Edmonson" <lpedmonson@...> wrote: > > Okay, so #02566 (automatic) on the Oregon coast has been running just > fine on its weekly outings until recently on a cold (for the coast this > is near 32 F) day when I started it normally, and while letting it come > up to temperature in the garage it started running rough while doing > its normal idle hunting. > ------------------------------------ To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/