new to me 1998 E300 turbo diesel question here.

Starts fine, go to take off and it will start flashing the ! triangle light in the middle of the speedometer and it wont let it go past like 40mph or around 2000 rpms not sure. coast to a stop of just take it easy for a second and this goes away.

Seems like it only happens the first trip of the day or the first run after its been started.

Any ideas on what to look at?

Thanks

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"