1997 Caviler I replaced the crankshaft position sensor and got the car running but now I get code P0300 not really drivable. I read in a thread about CKP learn mode and a better code reader tool?

 

The code P0300 is for Multiple Engine Misfire. The possible causes for this problem are the base engine mechanical fault that affects one or more cylinders, fuel metering fault that affects more than one cylinder, fuel pressure is too low or too high, fuel supply contaminated, EVAP system problem or the EVAP canister is fuel saturated, EGR valve is stuck open or PCV system has a vacuum leak, IC control circuit is shorted to ground (an intermittent fault), Ignition system fault (a coil) that affects more than one cylinder. Check to see if you have any of these symptoms and try to rectify it. Hope this helps.

 

What about three year old fuel?