Sully
I'm Awesome
new O2s didnt do a damn thing.... I have a new gasket for the egr, I'll swap them out tomorrow as well as double check the torque specs on my exhaust system.
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I'm having this exact same problem on my 96 C1500 5.7L with a freshly rebuilt engine...and about the only thing I haven't replaced is the coolant temp. sensor, so I figured I would throw this out as a suggestion since I'm pretty sure if that went bad it would give out those symptoms
Have you checked the IAC to make sure it is not stuck closed?