Horrible misfires after day in the mud
 

Ok,after leaving the mud field, had a check engine light and very rough idle. Figured I'd let it dry out and after about 8 hours, fired it up, cleared service engine soon light and no further problems. Until now. Just changed steering pump, and had a geyser while bleeding. I cleaned out the engine bay with an alcohol sprayer, and immediately after the fact the engine idled rough. I checked for loose vacuum lines, dirty multiplugs, fluid in the MAF, no defects noted. I broke out the Ethos and pulled the following codes: P1000(54), p1000(62), p1000(67), p1000(57), p1000(70), p1000(75), all relating to various cylinder misfires and "catalyst damaging" misfires. Also, noted on the real time data that the fuel pump was "OFF". Why the hell would the fuel pump be off if the engine was running? Do you guys think that I have a failing fuel pump?, thats all I can come up with at the moment, any help would be greatly appreciated! I should also note that the engine is now barely operating, I had to limp it home at about 25 mph and even then it was running horrible and the service engine soon light was alternating between steady on and flashing. Thanks in advance, all!

Take it to the coin car wash.
Spray a few cans of Gunk engine cleaner into it
Clean off the whole engine

If there are traces of salt in the mud - it will be conductive.
Probably other things in the mud too - like traces of copper.

Clean off the whole engine.

I would also stay out of the mud from now on - if you can.

alcohol will dry up rubber lines and hoses makes it look good but will make hose and vacuum lines wear out faster

First get a different scanner so we can see the actual Rover fault code. When ever you clean the engine, do not use soap of gunk near any of the electrical connections this can cause you a lot of electrical grief. If the engine is dirty do to a do it yourself car wash and use the cold high pressure rinse to clean the engine bay as long as you have replaced your factory plug wires, otherwise you will have misfires.
I have washed my engine at least once a month for over the last 10 years with no issues.

Ok, good advice, I am off to the car wash! Glad to here that no one thinks it's a fuel pump issue. This is not my first time in the mud with this car, and the engine bay is rather clean, so I ruled out engine contamination, guess I was wrong! Will post back with results of the clean out, thanks again! Hate staying out out of the mud, tho.

Good, do that and if you still have codes, get them read again with a scanner that gives "P" codes so we can see what the Rover fault code guides tell us.