Stage 1 misfire p0300 and p0303

[RyGuy1050]

As the title states I am getting p0300 and p0303 misfire codes after upgrading to Eurodyne stage 1, I replaced my spark plugs about 1000 miles ago with denso PK20TT-INT, I have a spare coil pack laying around so I swapped that on cylinder 3 and helped a lot, but around 20psi the car starts to feel like it wants to misfire, shuddering and hesitation.
Any suggestions? Should I try all new coil packs? Maybe a different heat range spark plug?

[RyGuy1050]

It pulls pretty well with partial throttle, as soon as I step on it, the turbo tries to go full boost almost instantaneously. Is this normal for stage 1? It jumps to 22ish psi right away and stuffers...

[Luis_Heineken]

Try the High Pressure Fuel Sensor
Located on the fuel rail (06J906051C, confirm fitment)
and
Low Pressure Fuel Sensor
Located on the high pressure fuel pump (06E906051K, confirm fitment)

That same thing happenned to me, plus i replaced the fuel filter too (4F0201511E)

[Rulty]

Sounds like you need a step colder plug if this issue still isn't fixed.

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[RyGuy1050]

I went with a colder plug and all seems well. Thanks for the replies!

[German_auto]

I did new coil packs and new spark plugs, as i had the same issue.