injection pump seal causes this problem alot . hope it helps

 

my landcruiser done the same i was pulled over while on phone for 20 min and i went to take off and it just started to run really rough and the white smoke out rear is super bad the oil is very thin and it has a sour smell out exhaust. when trying to baby it home it has ignited on its own fuel the i had to some how try and stall it. what do you guys think