Problem After Not Starting My Es300 It For A Few Days.help!

[pete rock]

ok let me know lay this out the best i can.i go to new york every weekend friday through tuesday.my car sits in a bus station park and ride for those days.when i come back tuesday evening.my car hesitates to start,when it does.i put the car in drive and start to move in which she hesitates and does not accelerate normally when i hit the gas.its running but doesnt accelerate with any powe.rthis last time i was blowing smoke out of the exhaust.after about 3-5 minutes round the parking lot it starts to drive again back to normal.if i drive the car everyday this doesnt happen its only when i leave the car for a few days sitting.anyone have any suggestions or experience with this problem?any and all help is much appreciated thank you