Got three quarters of the way to work the other day when the engine starts stumbling and wants to stall. Finally realized that something was upsetting the low idle, causing the oil pressure to drop and the engine to try to shut down.
Pulled trouble codes 28, 32, and 45.
I removed the EGR valve and found a small piece of carbon-like crud wedged between the poppet and the housing, preventing the valve from returning to its closed (?) position. I'm guessing that's the cause of this episode.
I'd also like to check the EGR control solenoid and thermostatic vacuum switch, but where are they?
While I'm waiting for your answer I'll be trying to re-plug the air leak through the intake manifold gasket that causes an IAC error and racing engine. Pulling the EGR valve disturbed the silicone rubber patch that kept that problem at bay for the last several years.
Thanks,
Mike D.