Is what we're talking about now, the pcv, possibly be causing it to run as bad as it is after 30 minutes-1 hour of driving? I spoke with someone yesterday about the canister on the firewall that contains a charcoal filter that will sometimes clog up and cause circulation problems. I forget what he called it, but it's on the firewall on the driver's side just under the ignition module and it's about the size of a big can of beans. Is this something of concern for what we're talking about?