I have a 1981 380 SEL

Just got the A/C serviced (never used it before)
when I turn it on everything is ok until I put it in Drive, engine shuts off automatically.

Also if I put the car in gear (no A/C on) and turn the steering wheel all the way right/left, also shuts off..

what is wrong?

I have changed:
distributor cap,rotor, spark plugs &wires, ignition coil..
2 fuel injectors, (#1&2 cylinders), fuel filter,
changed engine oil,
engine shocks & engine mounts...
Belts look tightened...

engine also shakes in gear at low rmp, neutral & park OK..

All help appreciated!!!!

http://www.cardomain.com/ride/1722657