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Hello! This is my first post, as this is my first focus. I have a 09 SES 5 Speed with 170k miles. The car runs awesome. Motor doesn’t seem to have any problems, no check engine codes. But recently as I was driving it, I felt a loss of throttle response and it seemed the car had a hard time reaching higher speeds it had no problem doing before. I don’t know a lot about these cars, so I was hoping to look for some insight about what’s going on. It feels like there’s a lack of power all around as the response is slower and it loses power at high rpms. The motor idles fine in neutral and under load as well, and there aren’t any misfires, so I’m clueless. Anyone know what’s going on or have an idea?

enjoy a pic of the car and my dog inside the seat
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2007 Ford Focus ZX3 2.0 Duratec
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Start with basics!

Did you change your fuel filter and spark plugs when you first got it? After that coils, injectors, bad o2 sensor.....Hook up reader to check your fuel trim
 
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