20°F Cold Start • No Glow Plugs • L5P Denali 🔥 2019 GMC Sierra Denali L5P Duramax Stone-cold start after sitting overnight ❄️ 20°F temps • No glow plugs • No block heater This truck is running our custom engine transmission tuning, and yes — it’s glow plug deleted. Cold start speaks for itself. This is exactly why proper calibration matters. Glow-plug delete setups require custom tuning to start, idle, and run correctly — and that’s what we specialize in. Why glow plug deletes are common on Dur
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