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A bad fuel pump will not necessarily show a code. If you have a throttle body try spraying a little bit of starter fluid into it. Then try to start the car. If you have it will be under under the air cleaner cover and kind of looks like a conventional carbureator. If it starts with starter fluid and then dies you have a bad fuel pump, or clogged fuel filter. The fuel pump will be in the fuel tank. Im not sure where your fuel filter would be.
Start with the simple and replace your fuel filter. A dirty fuel filter will cause the issues you have described and not have a DTC code show up. The other thing would be a stuck EGR valve from carbon build up and can be cleaned with throttle body cleaner or Seafoam.
Start with the fuel filter and will not hurt to clean out your throttle body and engine with Seafoam.
Try hitting the brake off and on to see if the rpm changes when you do that with the car in park. If it does, you may have a ruptured brake booster. A fluctuating rpm while your car is in park with the brake on indicates a vacuum loss. Other things may cause a vacuum leak including the air conditioner controls inside the vehicle. Other things that cause this may be cruise control or your Air Conditioners high idle solenoid.
It could be that the fuel filter was put on backwards or it could be the wrong filter. Some fuel filters will only allow the Fuel to flow a certain direction properly. There should be an arrow pointing the direction of flow on the filter or in and out are stamped on the end of the filters. If you can I would crawl underneath your car and locate the fuel filter. Look for the fuel line that comes from the fuel tank and follow it to the Fuel filter. Look for the arrow or the in and out. The back of the arrow should be where the line comes into it from the fuel tank and the head of the arrow should be connected to the line going towards the front of the car. If in and out are stamped on the filter, the line connected to the IN side of the filter should be the line coming from the fuel tank and the Out side should be the Line going towards the engine.. Hope this helps a bit
under the car should be on the driver side toward the rear of the car. you will need some good ramps and or some car jack stands to get to it.if you are uncomfortable with attempting this just take it to any oil change shop and most will do the job for abuot 25 dollars