What could possibly cause my '78 to seem to loose power briefly after a turn left or right?

Plenty of fuel
Doesn't happen if I slow to turning speed but stay straight then get back on the throttle and accelerate.

Seems like I've seen a thread about this before but I didnt find anything in the archives.

Thanks
Phil

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

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"