I just finished replacing the the injectors in my 05 Lgt, upon Startup it took a while to start, as expected, but now three hours later it still takes 6-7 cranks to start, but once it starts, I can turn the engine off, and then it starts right back up in two-three cranks, wait another hour and it takes 6-7 cranks again, the car also shakes slightly and the dash gets dim, I looked at the top of the passenger side from injector, and the little gray cap at the top had a crack in it, could this be causing a loss of fuel pressure? I’m not exactly sure what that cap is for, but I took it off the old injectors and put them on my new ones