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I am a old machinic as well and I would aggree if it was not the fact that a bouching pointer is not all that unlikely with todays motors.
So watch and see it the pointer bouches on a cold motor...egr does not normally cut in until the motor is warmed up.
Second I would shut down the egr to test the gauge before I tore into the motor.
Last is of course a dry and wet compression test.
My 2 cents worth.
After all I have tons of power and get a nice clean 29 MPG stock with a bouching pointer...
And have done so for the past couple of months.
Rich
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