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Discussion Starter · #1 ·
'03 Zetec

Just replaced the cat, egr pipe, valve, and DPFE sensor/hoses. I cranked it up, drove down to the gas station and filled it up and noticed the idle was fluctuating between 500 and 800 with a little shudder at the lowest rpm.

I've checked all the vacuum lines close to the area I was working and nothing is hissing or looks worn. I replaced all the PCV hoses and the valve last year as a preventative bit of maintenance.

What else could be causing this? I do have an exhaust leak either at the head side of the manifold or the cat to manifold side that I just noticed as well. Could that be causing the lean condition?
 
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