EGR code back again. As listed in a previous post, I unstuck the EGR valve on my 1999 Tahoe 5.7l. It is still throwing code 405. I priced a replacement, and I am not happy, nearly $200.00 for an EGR. Nuts,I'll just try and get the car passed through inspection with it intermittant. Though I do have an EGR from a 97 3.1l engine, but the plug is different. Anybody have a wiring diagrams of the plug for the EGRs of both cars. I would like to give that a try.