If there is a difference between the air mass desired and the actual air mass, could it be the EGR restricted ? Air needs to be able to get into the engine.
Perhaps a cleaning of same would be at worst a positive step and one in a process of elimination ?
Did you say the problem has become increasingly worse over a period of time ?
Perhaps look at an internet search for something like clogged EGR symptoms ?
Last edited by Lancee; Jan 4th, 2023 at 12:19.
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