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you have a bad fuel filter or your fuel pump is going out..
but if you know that is good check your air intake a crack in your tubing will cause the same problem because it has a- m.a.f.
sensor
Have your mechanic check the oil pressere with a scanner or a manual gauge if pressure is different from gauge it needs a sender or the gauge needs replaced
Remove the plastic trim over the front and rear seat rails and you will see two bolts in the front and two in the rear, reach under the seat, disconnect the wiring to the seat and then remove front and rear bolts and careful pull seat out through the door opening, it is a tight fit don't damage anything, take your time.
this is one of those situations that a professional diag would of saved you alot of money. Its possible you just got bad gas and your injectors are partially clogged. An 02 sensor would not give multible misfires. EGR would only misfire at idle if stuck partially open since its suppose to be open cruising. Fuel filter would give you a starvation issue but if the misfires happens at idle then the filter most likley is ok.
Data from a professional data scanner will store the conditions when the misfire occurs. Also for a chevy each cylinder will have a misfire counter and one can see the misfire happening as it happens. If its idling and misfiring and gets better as you rev it up most likely you have clogged injectors or a intake vacuum leak. You can test for a intake leak by spraying the intake area with water(idle will faulter if it draws water in), or use brake cleaner (idle will raise when fluid gets drawn in).
If no leaks are found I would do an injection service or at least add two bottles of techron to a full tank, drve till half a tank then top off again.
Also if the catalytic converter is clogged the backpressure could cause all sorts of misfire issues. Removing the two upfront 02 sensors and driving will indicate the exhaust is clogged or not. We put a pressure sensor in place of the 02 sensor. If the pressure is above 5psi this would indicate some blockage. It should be below 3psi at 2000 rpm. Also if you have K/N filter the oil from it will coat the maf sensor wires in time,, (always). You can remove the sensor and spray the wires with brake cleaner to clean. DO NOT touch them. They can be brittle. Look at the wires for color. They should be shiny silver. If its coated the PCM will not see the air volume or accurately see the air temperature. Without this information the PCM will not add enough fuel which will create a misfire.
The fuel filter is located in the pressure line that runs from the fuel tank to the engine,
near to the fuel tank. Keep the engine off for few hours before replacing the filter, to get rid of some pressure in the lines.
Does it misfire under load like when you press on the gas peddle after slowing down then accelerate or at idle. When you say spark plug did you mean all the spark plugs?
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