That means that a # 5 engine cylinder misfire has been detected :
In the case of a 2001 Ford Windstar the engine cylinder locations are numbered
firewall
1-----2-----3
4-----5-----6
front of vehicle > driver
You can drive it in for repair , just avoid any rapid acceleration or deceleration because you can damage the catalytic converter
Trouble code P0305 means:Cylinder 5 misfire detected
Trouble code P0305 means:Cylinder 5 misfire detected
Trouble code P0305 means:Cylinder 5 misfire detected
Trouble code P0305 means: Cylinder 5 Misfire Detected
P0305 is cylinder number five misfire detected.
Trouble code P0305 means:Cylinder 5 misfire detected Try replacing the plug wires and double checking the spark plug gaps
Cylinder #5 misfire
Trouble code P0305 means:Cylinder No.5 misfire detected
misfire cylinder #5
cylinder 5 misfire
# 5 engine cylinder - misfire detected
P0305 means that the # 5 engine cylinder has a misfire