2002 GMC Sierra V6 idles sometimes like it wants to turn off... I press on the gas peddle and does not advance as it should. The check engine light comes on then after a few minutes it goes off and drives fine. Dont remember what the diagnostic code is but it said "fuel injecter closed circuit"??? Can anyone shed some light?

Sounds like a short to ground in the fuel injection wiring or a shorting injector.