Random shut off please help i am new to diesels
 

thinking about buying a 99 while test driving it i came to a stop and it shut of nice and smooth as if i turned the key off. starts right up no problem at all. service engine light on. it has 235k on it. its lifted high. also should i be worried about the automatic trans?

Could be as simple as a cps... If the trans performed fine and the fluid looks red and smells good, i wouldn't worry too much...