The older trucks don't care if the glow plugs work or not. I can't imagine that causing any limp mode but I've been wrong before.
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04.5 4x4 ~160k miles
DE 4", 5100s, LBZ MP, S&B LBZ air, KoryWillis Go-go Juice, Insight CTS, ADII, 8' Fisher, Highroller Ultimate Idler Arm, Profab delete, XD RareParts tie rods
Dirtymax this, Dirtymax that... :taunt