2003 Ford Explorer All Cylinders Misfiring - Other Trouble

I have a 2003 Ford Explorer, Flex Fuel. A few days ago I started the car and there was a brief fairly loud noise from the engine compartment area (maybe a pop), possibly followed by a one second or so alternator belt slipping type of sound. Sorry I can't be more descriptive, the noise caught me totally by surprise and I wasn't paying attention. I have started the car a few times since then and the noise hasn't repeated. The car idles and runs rough. I then noticed the Service Engine Soon light is on, I don't know how long it has been on.

I noticed a small rubber V shaped (about 1 1/2 inches long on each side of the V) hose (?) On the pavement near where the engine had been. I don't know if this could have come off the car.

Here are the trouble codes that came up, in order read by OBDII scanner:

P0300 - random/multiple cylinder misfire detected
P0301 - cylinder 1 misfire detected
P0303 - cylinder 3 misfire detected
P0316 - misfire deteced first 1000 revs
P2195 - O2 censor stuck lean (bank 1 censor 1)
P2197 - O2 censor stuck lean (bank 2 censor 1)
P0302 - cylinder 2 misfire detected (pending)
P0304 - cylinder 4 misfire detected (pending)
P0305 - cylinder 5 misfire detected (pending)
P0306 - cylinder 6 misfire detected (pending)

I don't think changing the spark plugs or wires will fix the problem. Maybe the ignition coil has gone bad?

A friend suggested disconnecting the battery for an hour so the computer will reset.

Any assistance is greatly appreciated.