2003 stock cummins noisy injectors??
 

I have a 2003 complete stock motor with 124,000 miles and I just had 2 injectors changed. The truck seems to be noisier now, ( sort of like a rattle at idle) then it seems to smooth out and get quieter as I accelerate. Any ideas guy's? Is there a timing sequence of sort when injectors are installed? The 2 injectors I had put in were new, not rebuilds. The truck also has a 2-3 second cranking time when it's warm. Is this normal? Help please! Thanks in advance!