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Hi Mark,
Welcome to the forum.
If I were you I'd send a PM to a forum moderator to get your thread moved to the diesel section.
How many miles has the sprinter done?
What sort of use does it get? Are you doing a lot of short journeys / stop start deliveries?
Do you always use the same fuel station?
Do you happen to know whether you've got a diesel particulate filter (DPF) fitted to your vehicle?
Your second problem sounds to me like it is going through an engine management cleaning routine - I could be wrong as I'm more familiar with the old stuff but it sounds like that to me.
As for the first problem I'd look at battery health / starter motor health. Have they measured the cranking speed of the engine?
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