so i just finished a timing chain and headgasket on my truck with a new EB 261 rv cam. so heres my problem turn the key and fires idles for a few second and just dies. i also just replaced fuel pump and filter. what could cause this problem?

 

Check the connectioins going to the air box. I cant remember if its the afm or maf but either way it that goes out it will do that. My friends truck had that problem. replaced that and it was fine. Also check your tps if its not plugged in it might do that.