[Brutal Metal]

Another thing to check it you PCV valve. I had a somewhat similar problem, not exactly as you describe, but its cheap and easy fix. So give it a shot if youre stumped.

Why are you running a PCV system in your Cobra? Gunking up the Intake track with oil vapor and sludge? NAH! Get K&N Breathers!
http://img254.imageshack.us/img254/5778/svtcobra048.jpg

 

[Brutal Metal]

he can't run the K&N breathers in Cali, it won't pass the visual portion of the SMOG test.

There's an Easy remedy to that, the day of the inspection re-attach the PCV setup, it takes less than 30 seconds.