2) Check that the air path from the intake manifold's boost fitting to the ALDA on the injection pump is clear. The small lines and changeover valve can plug up with soot from the EGR. 350's don't have a cat so it's likely not an exhaust problem.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.