Hello I have a Buick centry 2003 and it keeps stallin out on the machine it say misfire on plug 4 I changed all pluggs and still doin it. Do you know what it is
It sounds like you have a bad 1-4 ignition coil and/or spark plug wire. There are three ignition coils; 1-4, 2-5, and 3-6. You will want to inspect each wire to see if there are any places where the wire jacket is broken. If you have changed the spark plugs, then it is usually a good idea to change the wires as well. The ignition coils are located on the ignition module at the back of the engine. If you do change the 1-4 coil, make sure you don't tighten the new coil too tight.
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