I have a 93 190e with the six in it.Now that summer is here & the air is on the car will stop when it is at a idle, not all the time but sometimes (like at a stop light at rush hour) the temp on car will be around mid temp on the gage.When it cools down around 5 min it will start back.Sometimes I have to hold the gas to the floor just to start it that's getting common on a cold start too.Would this have something to do with the fuel pump or vaccum? Thanks Scott