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that sounds like those cylinders injectors might be the problem . When an injector over fuels or fails to supply fuel it would create a misfire just like if a plug or coil failed
Hello, You may have already had the motor scanned if you know which cylinders are misfiring. If you need a scan, go to Autozone, Advance, or Oreilys for a FREE scan to diagnose your problem.
The shaking and shudder are normal when you are losing half to a third of your cylinders. If you are confident of the cylinders that are to blame, you need to investigate why they are misfiring. The sparkplugs can be bad by now, but were probably good before the spark to them was interrupted.
Your vehicle has a coil on plug system. There are reports of problems on the NHTSA site but no Recalls were issued. You need to change the 2 coils and plugs for those cylinders. The problem will make other components like your PCM fail if it has not already been damaged.
The electrical system in the PCM gets damaged if the spark does not flow to the sparkplugs. The built up power can charge the chassis and knock out delicate small electronics so do not delay in fixing this.
Also the reports I have seen do not show any advantage to replacing all of your coils instead of the damaged 2. If the shuddering continues after the coil/plug change, you probably need the PCM. I know this is not good news but hope my solution is very helpful.
Hello: Remove the fuel rail with the injectors attached and wires connected. Disable the ignition system. Have helper turn engine over, see if 3 & 4 injector are firing properly, some times the fuel rail gets trash in it and 3 & 4 do not get enough fuel. Remove the injectors from the fuel rail and see if the inlet to the injector has trash in it.
If you had a scan tool you would be able to see the cylinder misfiring, i would try replacing the coil boots on the coil, there like replacing sparkplug wires but there small boots that pop on the end of coil with steel spring inside them, run truck and if misfire continues then you have a coil thats going bad,hope this helps. note if you could find out which cylinder it was you could swap coil with another cylinder and if skip move to that cylinder then you would know if its a coil this is after replacing boots.
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