I now realize I blew out the EGR valve diaphragm when cleaning out the intake/EGR piping of valve seat debris. I initially tried disabling EGR & fooling the sensor - made the EGR code go away but a lean code came back. I have a new EGR valve in hand now. Going to have to keep the piece leading to the exhaust manifold attached and remove that when the EGR & that pipe are off the car (tried with 1 1/16" wrench but it slipped off the flats). Now I'm trying to loosen the two 10mm bolts- only can really get on it with a short extension and stubby ratchet.. but can't break them loose. Any suggestions? I really don't want to pull the intake manifold just for this. Once I get the bolts figured out, will the coil pack or thermostat housing have to be removed? Thanks for any thoughts. I did try searching but didn't find much.