
What happened? While the shift lever on “D” and after about 3 kilometers of driving, I slowed down to a stop on a traffic light controlled intersection and waited for clear traffic to make a left turn. When able and after about 20-30 seconds of idling, I stepped on the accelerator pedal and the engine rev up rapidly to about 3,500-4,000 rpm with the car barely gaining speed. When I released and pressed the accelerator pedal again (a slow pumping action), I felt an “engaging-mild-thump” sound in the transmission and the car gained speed and shifted up to top gear okay. Again, while the shift lever on “D”, I cloned the driving pattern a few more times with the same result. With the shift lever on “S”, the same result. The transmission appears to be slipping-out-of-gear when the car slows down to a full stop to idle speed. The transmission was completely rebuilt at 177,000 km. and currently have 186,000 km. (9,000 km. on the rebuilt tranny). Workaround to get the car home: From Stop, I press on the accelerator to get the car moving, pump the accelerator until I hear a gear engaging then it drives okay. ANY THOUGHTS on WHAT WENT WRONG? THX.