help with my 89 300e

[maximus]

Here is the trouble guys everytime i start the car after about 2 may be 3 minutes the engine starts idling rough , i mean shaking to a point where it would almost die then after a couple of minutes the engine would ramp up high and settle back down to where it suppose to be : this doesnt only happen in the morning when i first start the car it also happens everytime i start the engine please help me