Missfire No.1 and 3 Cylinder, Car shakes on idle, Oil on Spark Plug Thread

Discussion in 'URGENT - Help Quick!' started by goodybear, Dec 25, 2020.

  1. goodybear

    goodybear Member

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    Hi everyone, I hope you guys can help me fix this before I take it to the shop. Long story short, here's what I did 4 months ago.
    1. Replaced valve cover and gaskets
    2. Replaced spark plugs and wires
    3. Installed Oil Catch Can
    4. Big 3 upgrades

    A couple of days ago I filled up gas and CEL was blinking once I got to the freeway. It drove just fine until I got to the stop light and felt the shaking. It wasn't too bad and I was able to drive it back home. My OBDII reader posts P030, P0303, P0300, and P1399. Missfire is on Cylinder 1 and 3. I checked all of the spark plugs and found spark plug no.3 had oil on the thread (shiny not gunk). I bought new plugs and wires yesterday and still doing the same thing. I don't have a compression testing tool so I'm hoping to get second opinion as to what other things I need to look at.

    Any input would be much appreciated.

    Thank you
     
  2. ThatDesiKid

    ThatDesiKid Well-Known Member

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    Check your coil packs. Turn on the car and slide each coil pack out one by one. If you remove a coil pack and the car runs the same....that coil pack needs to be replaced.
     
  3. Sil2DrV6

    Sil2DrV6 Well-Known Member

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    EGR Valve, too.:afro:
     

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