transmission malfuction while pulling a trailer

YOU ARE CORRECT IN THAT I DO GET AN ERR COAD. IN FACT I GET TWO ERROR COADES. THE FIRST IS COAD 43 WHITCH SAYS THAT THE SPARK CONTROL MODGULE IS NOT RECEIVING THE SIGENLE FROM THE KNOCK SENSOR. I HAVE REPLACED AND CHECKED THE NEW SENSOR AND IT IS FUNCTIONING PER SPEC. QUESTION? WHERE IS THE SPARL CONTROL MODGULE? mY REPAIR MANULE SHOWES ANE TELLS HOW TO REMOVE & REPLACE BUT I CAN NOT LOCATE THE SENSOR WHERE THE BOOK SAY'S IT IS.??? THE SECOND ERROE COAD IS COAD 73 - THE SPEED SENSOR. AGAIN THE BOOK SHOWES AND TELLS HOW TO DO THE R&R BUT DOES NOT TELL YOU WHERE TO FIND THE DAMN THING. CAN YOU HELP???