My 2004 VW Beetle is struggling to start. It takes me 4 to 6 times to get it to start if it sat for…

My 2004 VW Beetle is struggling to start. It takes me 4 to 6 times to get it to start if it sat for 3hr or more and I just changed the starter but it still having problems. I think my sony radio is affecting the computer of the car because when I shut the car off the speakers make static noise. The car is cranking but takes forever to start does anyone know the solution to this?

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