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What make and model car ? P0172 OBD II Trouble Code could be running so rich that it fouled the sparks . Pull out the spark plugs and see if there are wet with fuel and black, means that they are fouled out. Have to be cleaned or replaced . I don't know the make of vehicle , so I can only give approximation what mite have caused this , a fuel pressure regulator with a ruptured diaphragm leaking fuel into the intake manifold, leaking fuel injectors P0172 System Too Rich Bank 1
Po172 refers to an oxygen sensor. But after you service the part you need to clear the code with an OBD II scanner. You can get a reliable inexpensive one at Harbor Freight. After you clear the code then you to start the car and drive it to see if the code comes back on. Also if you have a vacuum leak this can cause the system to run either rich or lean depending on circumstances.
Whats going on here is that you have a too rich fuel air mixture. This will cause your misfiring and set off the PO172 Code. Your Bank 1 O2 Sensor is picking up the too rich mixture. This O2 sensor is location on the #1 Cylinder side (so you problem could be in #1/#3/#5 Cylinder). A dirty MAF Sensor, loose plug wire, dirty/broken spark plug, dirty fuel injectors, vacuum leak, and PCV Valve could all be a cause. I would run some injector cleaner through and also clean the MAF Sensor, change your PCV Valve. This would be an easy and cheap start for you. Good luck and thanks for using FixYa!