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I have a 1990 Mustang 5.0 that will shut down for no reason. I have run the code scanner on it and I keep getting #34 (EGR). I have replaced the Valve, the Sensor and the Vacuum Solenoid and it has not resolved the problem. Anyone have any suggestions???
 

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If you have custom exhaust, the sensors may be reading inaccurately if the cats are removed. Also check the fuel pump.
 
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