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P0304 code V70-XC70 1999

Peter, the nasty engine shake was because of the 304. The old worn mounts just made it feel like they were at fault. The third time you started the car, the pending 304 became live and turned on the CEL.

So, you have to think about what happened to the wires/intake manifold when you fixed the PCV. Check the plug on the wire ends, make sure the pins haven't been pushed back and they make good contact.
--
Keeping it running is better than buying new






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