Im not sure what the gem module is or where it is located or what the COP's is. I am having a new windshield put in this week. Is there anything I can check in the meantime? I will have the abs scaned Monday or Tuesday. I will keep you guys posted. Thanks for all the help.

I have an 02 f250 with the 5.4L. It has 32000 miles on it. I have a list of problems that may be electrical but need to know where to start. The abs light comes on and when this happens the tac and speedo go crazy and the engine starts skipping and it loses power. The abs light comes on even...