P0108....Manifold Absolute Pressure/Barometric Pressure Circuit High Input
P0300....Random/Multiple Cylinder Misfire Detected
P0400....Exhaust Gas Recirculation Flow
P0433....Heated Catalyst Efficiency Below Threshold (Bank 2)
Do not have a listing for the 0068 reading as it doesnt exist in my list ,looking at this i would block off the EGR valve with a nice home made coca cola can gasket and this should cure your problems
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