I recently got a 01 xj with a rebuilt motor that has been bored .20 over, and bigger pistons

The motor had 0 miles on it when I put it in, it now has 800

When it throws the code I don't notice any power loss of sound difference.

And when I clear the code it won't come back untill I shut the car off and start it up again, even then it's not a guarantee.

I've replaced the plug rail, plugs, crank position sensor, injector harness plugs .And I don't know where to go from here.

The only other code I'm getting is a P0705 that says transmission range sensor circuit A, which believe is a faulty nss.

The code for the misfire is P0301

Also the Jeep smells like gas, strong smell