780 450 sl The car starts fine in the morning but after it has been sitting for an hour after running it is very difficult to start.

And last night it stalled but I got it started after 15 min but it only ran for 1 minute. It did this about 6 times before I was able to drive it home.

The car has new injectors, fuel pump, accumulator and filter.

Any ideas on what the problems might be?