If cold start is not smooth, you cold be looking at an ailing seal introducing air, or one glow plug failed...check fuel return line for bubbles.
I've also seen a few older injection pumps do that, and falsely triggering the glow plugs for a few seconds seem to work around the issue. As a quick check, when you are having the issue, use a short U of #10 or bigger wire to jump the 2 big terminals on the glow relay, count to 10, and have a go at starting the car.
Also if you have some type of primer pump, prime and try to start...if fixed air leak in fuel supply.
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