I have a 1993 400E. I have a problem with the vehicle hesitating after sitting for about 3 days. If the vehicle sits for about 3 days, it will have bad hesitation to the point it almost stalls unless I put it into neutral. Anyway, it will clear up after about 7 miles. I tried to take it to a local mechanic and by the time I got there the car ran great. I tried replacing the plugs, but it didn't make any difference. Any suggestions would be appreciated.