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P0300 is for random miss-fire, loose or defective gas-cap, water in the fuel, damaged vacuum line, clogged fuel and/or air filter, faulty plugs and/or wires, fuel injectors.
Fuel filter has nothing to do with miss fire until high rpm's if the filter is restricted. The ECU usually sets a code for the miss and if it is intermittent and random cylinders you will get a P0300. If it is a particular cylinder or cylinders you will get a P030* the 'star' being whatever the ECU has determined is the cylinder/s. 1, 2 , 3 , 4 etc.
The amber MiL light, lights on a number of problems. You need to get it sorted, you could miss a serious fault, and cause More damage. Needs to go on a code reader. From past experience with Punto's, the stutter could be a ignition coil fault (quite common) or a spark plug, both will cause the light to come on. Good Luck.
this code is for a large evap system leak. it could be the gas cap not sealing properly or a vent hose has come off possible seal around fuel sender. the most common cause is a loose or faulty gas cap. a smoke tester is what is needed to find a leak it basically fogs the system and pressurizes the fuel tank any leaks will be seen by a "smoke" coming out of the area.
check engine lights can come on for a variety of reasons anything from low oil to a **** miss fire or a low voltage reading on a scencer i would have the computer scanned for any codes and cleared.
1. Disconnect negative battery cable
2. Use a snap ring pliers to remove retainer from brake pedal pin.
3. Remove the switch by unsnapping it from the pushrod, and disconnect wiring harness from switch.
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