One problem related to constant velocity joint has been reported for the 1999 Mazda 626. The most recently reported issues are listed below.
The consumer stated while accelerating the transmission slipped. There was a slight chattering noise. Once the vehicle was in gear it worked correctly. A local mechanic changed the spark plugs and the wires. Also, checked the cv joints and they were fine. The mechanic had not looked at the transmission. He eliminated all of the other things first. This has been happening for about three or four months. (11/17/05) the mechanic suggested that the automatic transmission was the problem.