i cant remember how long iv had this problem, but its been at least 3-4 months. ill run my truck long enough to let it get a little warmed up then shut it off. soon as i turn it off i hear this buzzing sound coming from the driver side. sounds like in the area of the injectors. usually it goes away after 30 seconds maybe a minute tops. no codes no problems at all. just the annoying buzzing sound.

what could be causing this? is one of my injectors leaking/bad?

 

If an injector is leaking your fuel pressure on the rail should drop quick. Hook up a gauge and watch