One problem related to speed control cable has been reported for the 1999 Jeep Grand Cherokee. The most recently reported issues are listed below.
Intermittent engine idle problem. Occurs when engine is fully warmed up and in gear and at a full stop. Engine idle speed will fluctuate between 300 & 600 rpm . When this happens, engine roughness is very noticable and on occassion it will stall. On the first visit to the dealer, the computer was reprogrammed as per a TSB. This did not solve the problem. Second visit, Chrysler advised the dealer to replace throttle position sensor. Again the problem still exists. The dealer has notified Chrysler and is still waiting for an answer.