how to fix dtc p0101&p0300

2002 GMC SAVANA
96,000 MILES
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MOTOR1
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wasrunning rough and had dtc p0101and p0300.tuned it up and replaced massair flow.cleared codes.started van cel started flashing has same code
Nov 22, 2011 at 12:33 AM
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DRCRANKNWRENCH
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I am giving you the diagnsotic procedure for the code 0101-0300. Also, these Diagnostic refer to the Engine Control Diagnostic which is also provided. This would be the next step to take.
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Nov 22, 2011 at 12:54 AM
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RASMATAZ
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Could be a vacuum leak and bad fuel also be the MAF sensor-clean it and see what happens
Nov 22, 2011 at 12:55 AM
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