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motronic help needed



car: 87 jetta wolfsburg 2 dr, 280 k miles
mods: unknown cam, tt exhaust
problem: idle fluctuates from 1000 to 1300 rpm at 5 second period. smooth
fluctuation, with no sudden changes in rpm.
it seems as though if it went below 1000 it would start stumbling, and the
engine mgmt brings it back up to prevent a stall. it never gets a chance to go
that low, as it goes back up to 1300.

suggestions?

thx in advance
Al