300e Stalls when cold

For the past 2 months poor idle when cold.

Once past idle runs smooth with great acceleration.

Today, idle was worse than before. After driving four miles I stopped at a red light and the car just barley restated. Drive at 55 mph for one mile stopped at another red light and the car would not restart.

Two hours later the car did restart with poor idle and did drive for two miles to home.

What do you think?

Notes: no vacuum leaks, plugs, wires, cap, rotor three months old and have been rechecked. I am a retired auto teck with only limited experience on MB.