Hey guys trying to figure this one out, its an 03 duramax, hypertec programmer and straight exaust, I have roughly 185000 km on her and its hard to start when it warmed up. it seems to turn over for 3-4 seconds then catches. other then that it runs great. thanks for the help.

no one here has had hard starting problems with there duramax yet when there warm??????????????????

Injectors no doubt about it. GM extended the warranty on the injectors on the 01s and 02s. The 03's the deal with on a case by case basis. Put up a fight and refuse to pay a dime. Let GM pay the bill because they know the problem exists.

Good luck.