As for the Idle change..
in anther post you stated:
Quote:
Originally Posted by Racinfan83
My A/C is also now converted to R134 and works great!
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This is why the car almost dies with the AC on.. R134a runs a higher Head pressure then R12, which in turn loads the motor a bit more, when the AC is on will cause it to almost stall because the a/c idle adder (in the PROM) is set too low. The Factory cal changed in later years to accommodate this I believe but not in the 1990 Cal
Oil leak on Passenger side...
Depends.. it could be a sensor, oil cooler lines or a stud int he middle of the exhaust manifold causing the leak
the rattle could be the trans which is not uncommon.. do you know if the Dual Mass flywheel is still installed or is there a lighter single mass in its place
As far as shifting, I would look at the Clutch hydraulics sounds like they may need attention too