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I have a 99 Ford Ranger 3.0L Fuel Flex. It has a really rough idle and little to no power. Also, it has a hard time running with the air conditioner on. Have changed the coil pack but it really hasn't helped much. Have replaced the plugs several times. It has been having a problem were one of the plugs goes bad after about a month of use.

It gave 7 codes...
P0303
P0304
P0306
P0133
P1401
P0171
P0174

Anyone have any ideas?
 

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its rare but i have had a vac leak cause a misfire on that motor i would also have to ask how long the plug wires have been on there can you hear it sparking or do you see it at night
 
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