URGENT missfire sluggish lots of smoke

Last week iv noticed a droning wilting noise coming from the engine area. And now today I had the engine management light start flashing and started running sluggish and smoking a lot of white smoke. Iv also had my battery changed over in last couple days but battery now is only 40ah not 45ah. I have a 160 mile journey I need to make tomorrow any help would be greatly appreciated. Thank you

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