82 911 SC rough idle and stalling problems

[Rodney Nelson]

I was leaving work on Wednesday and my car barely started. Once I got it going it would idle really rough. I left work and every time my RPMs would drop below 2500 it would start to die. What is perplexing is my car has been running great. This is my second 911SC and my 6th 911. I love these cars but I can't seem to figure out what is going on.

I checked all of the normal stuff, plugs are new and in good condition, wires are new and in good condition, Cap is new and rotor is in good condition.

So then I decided well I'll check out the fuel filter, so I changed that. I also put in a new air filter, not that it would fix anything.

So long story short.....Now what? What would all of a sudden cause this to happen? On the way to work and since I have owned the car over the last 3 months it has driven super strong. All cylinders have 3 to 2% leak down when I did the instpection, and it only has 76K on the motor.

What should I check next before I take it into the shop?

Thanks for your help!!!!

Oh yeah check out my new licence plate.

[john walker's workshop]

i would see if the frequency valve is still working . there's a relay under the front of the passenger seat, between the oxygen sensor computer and the tunnel. at idle, unplug the relay and listen to see if the idle drops off, or stays the same. if it drops off and runs rougher, the system is working. no change, and you figured it out. could be just the relay, or the relay may not be getting power. power comes from the fusebox, at the same fuse that works the domelights. do the domelights work?