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Start with vacuum leaks and check all the hoses and connections. If the oxygen sensors have never been changed, you should do that. They are like light bulbs and they burn out. The other things are to check the MAF sensor to see if it is clean, Same with the idle air motor and then check the valves etc with a cylinder leak down test.
There is a common misconception that a CODE READ and a DIAGNOSTIC TEST are one and the same.. They are most certainly NOT!
The first thing to have done is to verify that the engine has a misfire or not. Then if the misfire is present, determine what is the cause of the misfire. A misfire in and of itself will not cause n oxygen sensor to "burn out". However if the oxygen sensor is bad, it will cause a performance problem and also cause an idle issue. What needs to be done is to connect the vehicle to a scanner and observe the data when the problem is happening. That way you can know what the fuel mixture is and whether of not the oxygen sensors are working properly.
Unfortunately, there is a lot more to engine performance diagnostics than just a code reading.
hi I assume this is a fuel injection vehicle and if so it sounds a lot like you have a throttle body problem or throttle sensor problem ,have you also checked that the fuel filter is not blocked,remove the fuel filter and blow thru it in the direction of flow and if your cheeks blow up while blowing thru the filter it is blocked or restricted -replace.
hope that helps .
PO300 codes are cylinder misfires Lot on the internet you can study Usually a failed coil but not always the one you get the code for May have to walk a new one from cyl to cyl Did you create a vacuum leak While your working on it loss the front oxygen sensors They are only good for 100,000 miles
sounds like an electrical problem, the cheapest thing to check is the lambda sensor, which is located on the exhaust. this senses how much oxygen is in the exhaust gases, and tells the ecu to change the fuel to air ratio.