So I've ran into a similar issue; P0301, P0303. Misfire on Cyl 1 and 3.
- MAF sensor has been checked and cleaned, it's good.
- Had a spare coilpack sitting around, which I used there, and it's good.
- Spark plugs are brand new as of 5000 km ago... Haven't pulled one out to check the condition.
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Bosch Platinum 4418Seems bizarre to me, when I'm at idle, it doesn't idle right. The Tach is reading low, like sub 250, while the Dashcommand is reading 600, which is normal. The entire engine lugs and is visibly moving (that may just be bad bushings) but it moves the car around too. There also sounds like something struggling around cyl 4, while cyl 1 and 3 sound fine.
However, when I high idle it to 1500, the engine light goes away, everything smooths back out to normal, and it seems good to me.
I used the oxy at work on a very low psi and slowly moved it around the vac lines to see if there was any surges, didn't see or feel anything.
Could it be the fuel filter is clogged? At idle, the fuel pump isn't getting enough demand to push the fuel through, but when I idle it higher, it has that demand and pushes the fuel through?
This also happened *immediately* after filling up.
Noise and video of engine shaking.