Can anyone tell me the likely problem with my 2009 Shelby GT500 that throws the code P1238? It seems to miss a little once in a while now also. Forgot to mention this, The code translates as "Secondary Fuel System Fault" I replaced the secondary fuel system relay and went ahead and changed the fuel filter while I was at it. I cleared the code and it still seems to want to stutter every once in a while.
Have not had that code before on this car. Have the fuel pressure checked. Have had this type of code on other cars with variable speed fuel pumps. Was a bad resistor, but dont know if the Shelby works that way or not.
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