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V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters
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2004 throwing codes after tune-up

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Old 07-25-2014, 01:54 PM   #1
Join Date: Mar 2014
Vehicle: 2004 40th Anniversary Convertible
Location: KY
Posts: 4
Default 2004 throwing codes after tune-up

I have a 2004 Mustang with the 3.9 engine. It had been idling rough and having lots of hesitation under load. The CEL flashed and I got a P0303 code. I replaced the coil pack (used Motorcraft brand), the plugs (NGK) and the plug wires (whatever the brand Autozone had in stock). Everything has been fine for a couple of weeks until today, the car started running rougher than ever, had major hesitation when accelerating. I got home and pulled codes P0300, P0303, and P0316. I am pulling my hair out, any idea what is going on? Any and all help would be greatly appreciated.
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Old 07-25-2014, 01:54 PM
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