Originally Posted by shams13
1. does vaccum leakage cause hard shift?
2. why there is a minor clunk sound on shift down from 4 to 3
3. taking off the throttle pedal, it shifts to next gear at low speed

1. YES.
2. Possibly lack of vacuum causing harder shift and/or loose/worn flex disk(s) or mounts.
3. A Bowden cable is used to monitor pedal travel, lifting pedal will allow upshift sooner.

Please read this article, almost everything you need has been written by SteveB.

http://www.continentalimports.com/ser_ic20242.html

Best Regards,
Jim