My 4 cylinder seems to miss fire in a cylinder sometimes when iding-127k. symptom is the car shutters while stopped intermittently while stopped from engine.......dosent happen always though. Thanx!

possible bad crank position sensor or loose wiring connection
compression will not change unless you have valve train problems ( loose rockers or broken rocker shafts)
so switching spark between cylinders or not firing a cylinder is a sensor or ignition control module problem
I suspect it is faulty wiring and harness connections , dirty, corroded or not making good contact

Fuel filter has nothing to do with miss fire until high rpm's if the filter is restricted. The ECU usually sets a code for the miss and if it is intermittent and random cylinders you will get a P0300. If it is a particular cylinder or cylinders you will get a P030* the 'star' being whatever the ECU has determined is the cylinder/s. 1, 2 , 3 , 4 etc.

Sounds like a faulty coil or spark plug.
You should have a check engine light on and codes for which cylinders are miss-firing. Could also be a fuel injector problem or vac leak.

Hi Jason:
A Random/Multiple Cylinder Misfire Detected unfortunately doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

A code Random/Multiple Cylinder Misfire Detected may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

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Yup, any time you give it throttle after it goes into overdrive it will shutter like that, and have a miss at idle. This is called a dead cylinder and happens to a LOT of vehicles nowadays. Meaning it's a common situation. Have each injector checked with an ohm-meter. The one that reads low is faulty. If none read low and all are the same, you have a bad exhaust valve and it's needing attention. Have a compression test done with all the spark plugs out to find which has very low compression. That would be the "dead Cylinder".

Check spark plugs
check spark from spark plug wire
check fuel injector

OVP relay, coil and wires usually are the culprit. If not then it gets spendy. EZL is alot and may be an issue. EHA / EGR tube gets clogged also which comes off the exhaust.

Problem could be as simple as a vacuum leak around either of those cylinders. A vacuum leak can create a lean fuel mixure condition resulting in a miss fire. One thing to rememeber is that depending on the style of ignition in use. The opposing cylinder's spark plug and wires act as the return path for the unused voltage from the coils firing which is why you are having seemingly unrelated misfires. If either has a problem then the symptoms are shown in both cylinders.

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