Mercedes: mercedes 190e 2.6, mercedes 190e, change filters

Question
I have a mercedes 190e 2.6 1989! If it is a two hour stop the engine takes to boot, seems to be missing gas! but if she gets little time stop the engine starts perfect! What can be the problem ??????

Answer
If it is a two hour stop the engine takes to boot. ???
Are you saying you must wait at least two hour before the vehicle will restart?
.... gets little time stop?
Are you saying that the vehicle will start instantly if it is less than two hours?

Under what conditions are you operating the vehicle low temperature? high temperature?
When is the last time the vehicle had a tuneUP? Plugs, fuel treatment, change filters etc.
How is the performance when the vehicle is operating?

Rob