Hey, when you hook up your pcv valve from the lifter valley cover, check to see that one cylinder isn't getting more air than the others. I have an Edelbrock performer intake with a quadrajet. I feel that the fitting whichconnect the rubber tube to the intake is a little to close to the number 2 intake runner, causing cylinder number 2 to run leaner than the rest. if you have any info or thoughts on this theory, I'd like to hear them.