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I think they're taking you for a ride...............
A fault in the egr system will only make you loose power at most.
As for not firing on 2 cylinders......each cylinder has 2 spark plugs, the odds of 4 spark plugs or 2 coils failing together are slim. The ecu can shutdown cylinders though. I've seen a V6 running on 1 cylinder.....it just shut everything down.
Does the shop you've taken it to have a scanner to read the fault codes?
It sounds like the crank angle is failing, they usually fail when the engine is hot and the engine will die suddenly. Make sure they can read fault codes otherwise they are wasting your time and money.
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Alex.
MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
W203 C32
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