Stalling while cold only is probably a vacuum lean since the computer isn't doing anything but running a fixed mixture until the heater on the oxygen senor warms up. If the problem starts up a minute or so after starting, check the oxygen sensor.

Also check the function of the idle swtich. If not closing when at idle, the mixture will be too lean.

As for the relays, a bad fuel pump relay will do this, will the added bonus of stalling intermittantly all the time. However, you need to check the current draw on the fuel pumps as well (there are two) -- excess current draw will fry a new relay and leaver you right were you are again.

If the tach jumps around and the ABS warning light flickers or comes on when the engine is idling rough and slow, its the OverVoltate Protection relay (OVP). These are notorious for going intermittant. Easy check is to shake it -- if it rattles, it's bad (ditto for the FP relay).

If these don't fix the problem let us know -- you may have other problems with the fuel system.

Very bad valve guide wear will also cause serious idle problems, so will bad fuel injectors (you will burn enormous quantities of oil if the guides are bad).

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!