Originally Posted by armand1
I would think that you could test this by disconnecting the hose going to the canister at the purge control solenoid valve (this is up front) and trying to drive the car with the input to the valve blocked, then trying to drive the car with the input to the valve open to air. If one of those conditions keeps your problem the same, then that should be the type of problem you have.
Where is the purge control solenoid? Is it attached to the intake tube that runs under the pass side intake manifold runners?