I am having that exact problem with my 6.5 chevy diesel new glow plugs gone 4 months later Truck been running just a little rough too i guess it is time pull the new IP out of the box Maybe my vehicles just have been around too long like me

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commercial fisherman diesel in my blood in my boats trucks and Dear old Dad has had me drivin them since i got my first license in 1968
1986 300 SDL 427654
1999 Chevy Crew Cab Dually 225423
1986 300 SDL 287000 Dad's
1987 190 Turbo 158000 Mom's (my inheritance)