Checked the coil pack and plugs are clean and tight?
Check your spark plug wires first. Then check your spark plugs. Either one of your wires is no good and needs to be replaced or else a spark plug is bad and needs to be replaced. The only other thing I can think of is bad gas. If you are close to empty in your tank, go and buy some fuel injector cleaner from the gas station. You pour it in when close to empty and run it until empty then refill the tank with gas. If its a clogged fuel filter or bad gas the additive will take care of the problem. If it still back fires and vibrates then its time to check the spark plugs one by one until you find the wire or the plug that is bad. Then replace it. That should solve your problem.
SOURCE: 2000 ford focus mis-firing only when i accelerate / decelerate.
Does it still turn on the "Check Engine" lite. Did your mechanic recommend the tune up to "fix" the check engine lite issue or vibration issue? You may want to go back to that shop and ask them why the repairs they recommended didn't fix it? However if the ignition is good, and the compression is good, that pretty much leaves fuel system as the issue. You may have an injector not working properly. Try some good injector cleaner first. Try the Chevron brand w/Techron. It is more expensive but the solvents in that mixture really work well. Don't overlook fuel pressure, but that shouldn't pick on one cylinder. A new fuel filter would be a good idea anyway.
SOURCE: oil around spark plug and car mis fires
The oil around the plug may be a sign that the valve-cover needs a new gasket. Oil on the plugs can cause a misfire but it is important that you check everything over. The misfire could be due to defective wires, boots, coils, spark-plug/s, injector/s, and so much more. Take a look at the cars maintenance history, Maybe it is over due for a complete tune-up or oil change. The car is 11years old, how many miles are on it? How was it running before this?
SOURCE: Its a 2002 audi A4, the mis firing occurs when am
sound like a coil packed up on one of the cylinders or a sparkplug or a sparkplug lead if there is no coil packs.the vibration will be there when is idling because of misfiring.hope this helps
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