90 5.0l Running Rich

[BlueChevelle]

So my car was running fine and then my fuel return line sprung a leak. I changed both lines from tank to the fuel rails, and now its surging at idle and running pretty rich. I have new 02 sensors also. Any ideas?

 

[jrichker]

See the "Surging Idle Checklist for help with all your idle/stall problems. Everything you need to find and fix idle problems is in there.

The first two posts contain all the updates to the fixes. At last count there were 24 possible causes and fixes for surging idle/stall problems. I continue to update it as more people post fixes or ask questions.