OKAY..I'M PUTTING AN OBD2B GSR MOTOR INTO AN OBD2A LS SHELL..I'M USING AN OBD2A GSR HARNESS..EVERYTHING PLUGS UP, BUT THERE'S ONLY ONE PLUG THAT IS HANGING..CAN ANYONE TELL ME WHAT ARE THAT PLUG IS FOR..? AND DO I NEED IT?..THAT PLUGS CONTAINS 3 WIRES..DON'T KNOW WHERE THOSE WIRES GOES..TODAY..AS I WAS CHECKING THE ENGINE CODE CAUSE THE ENGINE LIGHT COMES ON..I NOTICED THAT THE CODE MIL READS "54"..ITS A CRANKSHAFT FLUCTUATION..DON'T KNOW WHAT THAT MEANS..CAN ANYONE HELP ME ON HOW TO GET IT FIXED..OR WHAT TO DO TO GET RID OF THAT..PLEASE..I'VE GOTTA GET THE CAR INSPECTED..

 

anybody else know? please help...