HI, Most likely cause would be a bad or wrong PCV valve or the hose that connects it to the carberator. Unplug hose from PVC and see if it makes a diff. If it does not, then passages in carberator and or intake may be clogged up. You will have to remove carberator to check & clean if it is stopped up.
Hope this helps.
Billybob
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Friday, February 1st, 2008 AT 8:49 AM