So I have a couple fault codes, 11 and 13, which are no referance pulse and no position pulse, the car still runs ok though. From reading around it seems like those codes are usually accompanied by poor running. Can the crank angle sensor go bad enough to throw a code, but not bad enough to notably affect how well the engine runs? The Check Engine light came on a few days ago so I have not filled up since it came on to know how the MPGs are.

Those codes refer to a possible circuit problem with the CAS sensor inside the disty.

Hmm, so open up the dizzy and look for anything blatantly wrong?

I doubt you will see anything wrong if you do that. You might try disconnecting the connector to the disty and reconnect it in case there is a bad connection there.

REPLACE the timing belt