"NEED HELP"Having major issues with 93' 300E 3.2L missing real bad in about 3-4 days
 

First of all, it started about the same time my air pump started squealing, (2 months ago) I don't know if that has anything to do with it or not. The car used to just cut out a little from about 20 to 40 mph or so. As time went along it started getting worse and worse. The last wk. it has gotten really bad, but the last 3-4 days it is doing it when it idols (occasionally) and pretty much all the way thru the acceleration cycle. It has started backfiring, but it seems like if I put it in low gear and manual shift, about 70% of the time it will rap out great until I shift and it drops to a lower rpm, and then it starts missing again. I am lost, going to school in a town where I don't know anybody, I have got to get it going, I finally found a manual for it, and it is on the way. Need to work on it this wknd. Thanks, any help is greatly appreciated