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There is an EGR Control Solenoid somewhere on MPFI engines... maybe what should you do is to replace all vacuum hoses that goes to the egr system and control solenoids, check cables an cracked hoses as well... to check the EGR get the engine to normal operating temp. Allow it to idle for about 60 seconds then open throttle abruptly so th engine runs at about 2000 or 3000 rpm then allow it to close, the EGR valve stem should move if the control system is working properly.
Never use any solvent like carb. cleaner on the valve or vacuum hoses since it will permanently damage the valve.
 
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