I am new to this site so bear with me. I have a 97 7.3 Ive had it about 2 months now and now it wont start! It will start and idle for 2 seconds then start knocking and die! I had a buzz test ran on it and all is good. I also checked my Icp and checked my uvch harness with my multimeter. Before this it would run ok but seemed like it had a miss and a lack of power. On start up if i didnt have it plugged in it would smoke white smoke horribly. I am thinking maybe my IDM. Well I hope so because I just ordered one on ebay. I need my truck for work so any help would be appriciated. I had it hooked up to a scanner and it said faulty IDM.

 

It's gasoline in the tank, or water thru the fuel heater.