Ken,
Have the Indy check the "O" ring on the little primary filter...since everything else was replaced. That $2.50 part that cost $.03 to produce can stop any well maintained E300 dead in its tracks if it starts drawing enough air. In fact...I would buy an extra one and keep it in your glove compartment.
Good luck

__________________
FRED

Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K