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Mis fire problem
1999 Buick LeSabre

Mis fire problem

(1999 Buick LeSabre)
My buick is having a misfire problem in cylender 4. I have changed the spark plugs and wires twice but the codes P0304, P0304 pd, and P0404 are now coming up and my check engine light came back on. Do anyone know how to fix this issue?
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Popular Answer
on February 26, 2013
This may be way too late to answer but may be worth it for the next person. I need to change the ignition module on mine. The code read misfire and that a coil needed replacing but when the new coil did not work it was discovered that the module was the issue.
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Check Engine Light Diagnosis
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on February 26, 2013
This may be way too late to answer but may be worth it for the next person. I need to change the ignition module on mine. The code read misfire and that a coil needed replacing but when the new coil did not work it was discovered that the module was the issue.
Sign in to reply

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At first the misfire was come and go but now getting no spark in cylinders 1,3,5,7
No other issues or warning lights come on. just drive a mile or so and starts locking up cant get it to go down the road