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Start with the easy stuff first.
Lumpy idle can very frequently be traced to the MAF. ESPECIALLY when, as you describe, it's fine when cold. But when the motor warms and it kicks out of the pre-programmed cold start settings and starts using sensors to determine settings then it gets rough..... yeah.... in my world that points to MAF all day long.
AND it's easy to check. When your idle gets rough, unplug your MAF and see if it smooths back out.
Always easy stuff first.
Sent from my SM-G970U using Tapatalk
Last edited by maytag; 01-04-2021 at 04:58 AM.
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