car runs rough when cold
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Rough Idle on Cold Melbourne Mornings? How We Diagnose EGR, PCV and Cold-Start Sensor Faults in Your Driveway
Car shudders and runs rough for the first minute on a cold Melbourne morning, then smooths out? That "cold start then clears up" pattern points at a handful of usual suspects — the EGR valve, the PCV system, or a cold-start sensor. Here's how a mobile mechanic tracks it down with a scan tool.
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