Hi there, my XJ 4lt "98 cuts out when working hard in 4x4 low range or on a hot day when the fan starts at around 100 on the heat guage, when the garage owners connect to the computer, they see money as all it tells them is to start charging, because none of them can work out whhat the hell is causing this problem>??????????

Please HELP anyone who knows from experience what this is??

Thanks........