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If your talking about taking out the flame proving rod and cleaning it with sand paper or abrasive cloth and that didnt work, you may have a bad flame proving rod and it needs replaced. If the flame sensor is good, it could be the board not keeping the call to the gas valve, the gas valve not keeping the call, or your thermostat not keeping the call. Hope this helps narrow it down.
There are a few reasons why your furnace is restarting after it reaches temp. and shuts off. First, if you have a mercury bulb thermostat it needs to be level and the heat anticipator needs set properly. If you have an electronic thermostat then you need to make sure the DIP switch settings inside are set properly for propane. If you have a digital thermostat there are also settings to be made for your type of heating. These settings will be explained in the thermostat installation instructions. Also, Make sure your furnace filter is clean. If this does not help then there are some other things to check which may need to be done by a technician depending on your mechanical aptitude. Hope this helps!
if the heater uses a hot surface igniter its a simple matter of unscrewing the igniter and replacing it with another unit. if it is a spark ignition, the spark wire is a heavy insulated wire that goes to the gap. check out white-rodgers for a replacement. if your furnace uses a purge mode get a purge cycle programmable igniter.