why does my car start fine when cold but when I let it warm up and push the accelerator it stalls and won'r stat again until it has cooled down.

What is your question?

I have had volvo look at it but they can't find anything wrong. Fuel pump is new, crankshaft top dead center sensor new, camshaft sensor new, throttle positioning sensor new, fuel pump regulator new, spark plugs new, timing belt new, battery new, fuel pump relay new

What makes this problem better or worse?

when I let the engine idle and warm up

How long has your 1993 Volvo 850 had this problem?

many many weeks...has not been drive able for 1.5 years