New clutch, new TPS - makes the bells start ringing especially if they
replaced the hydraulic clutch parts.  How do the voltages on the TPS look?
Do they vary smoothly as you move the throttle?

I'm surprised Mike didn't bring up the ground strap - the clutch line runs
right by it and if it was beginning to rot you can bet that messing with
the clutch line finished it off.  I would look at the TPS adjustment very
closely but running a jumper cable from the battery negative to the
firewall is a quick check for a ground that got broken during the clutch
work.  I don't remember the pins exactly, but the connector for the TPS has
three pins. With the ignition on (don't start the engine, just turn the
ignition on) probe the back side of the TPS connector and read the voltage
from the center pin to each of the side pins.  One side should be about 5
volts, the other about 0.1 volt.  The total voltage accross the outside
pins should be just under 5 volts.  Looking from the center pin to either
side, the voltage should vary smoothly as you move the throttle.

Another possible cause would be the Crank Position Sensor.  That connector
is tied to the firewall just above the exhaust - unplug it and clean it
just like you would the TPS.

I would really look hard at that ground strap from the block to the
firewall, though.

Isn't life grand?