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I have a 04 F550 6.0. I am getting codes P0671-678 (glow plugs cyl 1-8). Tested all glow plugs just to be safe and all are good like I assumed they would be. Replaced GPCM as advised by Ford dealer. Still not fixed and still throwing all same codes. Testing resistance on all wires as per alldata today. Has anyone else had this problem?