Car was b#^&#^&#^&#^&#^&g at different speeds give it some gas it went away then check engine light comes on so I go to my nearest Auto Zone free check computer says #8 cylinder misfiring what would cause this any ideas.

Michael a cylinder misfiring could be alot of stuff, clogged/bad injector, bad/shorting plug wire, distributor, head gasket leaking, intake gasket leaking. I'd get it checked out though without running it that doesn't sound good...

what type of vehicle? what year? if it is coil over plug you probably need a pack and plug. judging by your business i would say you probably have a ford/ lincoln with a 4.6, if thats the case, definately pack and plug. water gets into the hole and shorts out the coil packs.

Most likely it is the spark plug. Also could be the ignition wire or injector firing problem. Other less possibilities are burnt valve, rings,vacuum leaks, etc. Pull #8 plug and take a look at it's condition. Hopefully, and most likely,it's just a bad plug. The cond. of the plug will tell you alot. Start there. Also look at the connections on each end of the plug wire, may be corroded.

Just bought it they cleaned the engine so it really sounds like a short in the coil pack this lady was really honest about everything over the phone then showed me all paper work to back her up it was just b#^&#^&#^&#^&#^&g she said it never did that the guy who cleaned the engine said it was probably water in it somewhere I figured something electronic,

Sound like it's most likely #8 plug wire.

Replace the plugs and wires...bet the problem goes away!:D

what type of vehicle? what year? if it is coil over plug you probably need a pack and plug. judging by your business i would say you probably have a ford/ lincoln with a 4.6, if thats the case, definately pack and plug. water gets into the hole and shorts out the coil packs.


That is what i would say also. if your check engine light came on there should be a stored or active code which would tell you specificaly if it is the #8 coil pack.

Just dropped it off will let you know when I get it back

70,000 mile never had a tune up we did it runs fine now.
Thank You