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I would check the clean power feed for the ECM ! It starts at the battery box and goes through inline fuses right at the batteries ! Then it continues on all the way to the ECM on the engine . A good visual inspection of that wiring inch per inch , may find your problem. Ihave seen in many cases, the clean power feed either rubbed out or corroded wiring along the way or dirty connectors too . Have a look at that and get back to me! If that doesn't help you , then I will need the 8 digit engine serial number on the engine and if the engine light is on , the fault code too if you have a code reader ! thanks !
Great we will check it out . We found loose battery connections so far