[2000CAYukon]

back2life,
Any updates on your problem? I know that 99% of the time it is the dist; however, I must be one of the lucky ones. I decided to replace the dist (due to the fact that with the EST disconnected, the timing seemed to jump every 20 or 30 seconds). I installed a brand new dist from Jegs.

It does seems to be running a little better; however, the idle problem is still there. This morning, I hooked up WinALDL and the BLM was 108. This indicates that the ECM thinks it is running rich so it is removing fuel.

The cat is original (17 years old and 125K miles). Can this be the cause of my issue? The truck passed smog a few months back but barely. It had the highest HC count that could pass.

The injectors have a nice cone pattern; although, I do notice droplets of fuel on the butterflys when it is idling.

Fuel pressure is 13 PSI and the regulator was replaced recently.

I also have bad valve seals (blue smoke at startup) and I have not had time to replace them but will soon. Can this cause the ECM to think it is running rich?

The idle issue is intermittent but it seems to get worse after the truck has been driven for around 30 minutes (bad cat?).

Any ideas or suggestions?

//2000CAYukon