Rough Idle, Strong Fuel Smell, Misfire Codes Detected
 

1998 Ford Econoline Club Wagon with the 4.6L V8

Over the past week the van developed a very rough idle, strong smell of fuel and is clearly misfiring. It stutters considerably after accelerating from a stop and has a loss of power. And for what it's worth, the owner says each time he fills it up, the fuel pump doesn't click off and the fuel spills out the filler neck onto the ground. I suspect fuel is overflowing into the charcoal canister. I pulled these codes:

P0171 - SYSTEM TOO LEAN BANK 1
P0455 - EVAPORATIVE EMISSION CONTROLLER SYSTEM
P0133 - OXYGEN SENSOR CIRCUIT SLOW RESPONSE BANK 1 SENSOR 2
P0300 - RANDOM MISFIRE DETECTED
P0301 - CYLINDER 1 MISFIRE DETECTED
P0303 - CYLINDER 3 MISFIRE DETECTED
P0305 - CYLINDER 5 MISFIRE DETECTED

Based on this combination of trouble codes, can anyone suggest a possible culprit? I don't know when the last time the van had any maintenance performed, but instead of throwing money at it maybe someone might see something stick out based on these codes. If the O2 sensor on bank 1 is defective, would that cause a rough idle?

Plugged/defective cat converter, plugs, wires, coils, timing chain slack, vacuum leak, bad ground, intake gasket, oxygen sensors, bad fuel, evap system issue?

Thanks in advance for any replies!