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  1. G

    Studder under load, P0301 Code

    Providing an update, the injector for cylinder 1 is bad. Replaced with CorkSport injectors and seals and the car is running good now.
  2. G

    Studder under load, P0301 Code

    thanks, I’ll do that this weekend. also, I ran a compression test and got consistent results back across all 4 cylinders. ~138psi dry and ~150psi wet for all 4. There was maybe a 2psi variance.
  3. G

    Studder under load, P0301 Code

    great suggestion. Most of the wire is covered by shielding. Anything specific I should be looking for? In image, left is coil pack for cylinder 1, right is coil pack for cylinder 2.
  4. G

    Studder under load, P0301 Code

    yes, all gapped to .027 or .028
  5. G

    Studder under load, P0301 Code

    Thanks for the reply. I'll check gap, they are NGK plugs. What should the gap be? Also, a quick update, a swapped coil packs on cylinder 1 and 4, and I am still getting a P0301 code after a few days of easy driving.
  6. G

    Studder under load, P0301 Code

    Hi all, could use some help. 2006 Mazdaspeed 6, air intake upgrade, Cobb stage 1 tune. Yesterday, the car started stuttering under load and threw a P0301 code. As the car warmed up, it got better, but still a noticeable studder on easy acceleration. Spark plugs had 90,000 miles on them, so...
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