If you're using starting fluid to start the car, your glow plugs are most definitely shot right about now. If the glow plugs check out, like previously stated, I would look into fuel delivery problems. What is the condition of the primary and secondary fuel filters? If the primary is black, it's most likely shot and has taken the secondary down with it.

Starting fluid will destroy your engine.

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Allen Kroliczek
Oak Grove Autosport | Oak Grove Autosport
01 G500, 82 300TD, quite a few more.....