Hard to start cold and rough running until warm means the cold start valve is suspect, it's not getting cold enrichment, or you have a vacuum leak.

I vote for the vac leak.

Check, in this order:

Main vac line to booster (loose connection on manifold)

Idle control valve hoses (if hard, replace)

Charcoal purge line

small vac lines to transmission modulator, ACC, temp switchover sensors, etc.

Another possiblity is the boot between the intake and fuel distributor.

It cannot be a huge leak, as the feedback system can compensate after it's warm. Big throttle lag sometimes?

Peter

__________________
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!