4WD DRAKE

For a while my F150 5.4 has had a slight shudder when getting up to speed, but only under a load. A few months ago I got the lean bank code errors but the mechanic didn't find the problem. All of the sudden my truck started running VERY bad the other day. I went to the auto parts place and the computer read cylinders 3,4,5, and 8 were missfiring along with the lean bank codes. I replaced the 4 plugs and coils, but noticed oil under the coils in cylinders 3, and 4. I also found coolant under the coil in number 8. The truck runs better, but still pretty bad. I also noticed my coolant reservoir was empty, but the dash never gave me an indication of over heating. Although I found coolant on the driver side cylinder, it seems to be leaking from the passenger side. I don't know if it is related, but my AC stop working as well. It seems like a million things went wrong over night. Any help would be appreciated, because I am stuck without a truck until I figure something out. Thanks!