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Discussion Starter #1 (Edited)
Hi everyone, I'm new here, glad to find this club and read on all the interesting topics.

I'm having a bit of trouble with my 04 wrx. I went to the trouble of purchasing a workshop manual (very handy) and serviced it a couple days ago, oil, filters, plugs, very basic. I took it for a test and it felt great. After a second drive, streching its legs, i noticed a jitter when boosting in 5th gear, and sometimes 4th. The only thing i could think of, was the spark plugs. i used, according to the manual the NGK PFR6G. The plugs that came out of the car were NGK BCPR7ES. So for a fraction of the price, i went and got the NGK BCPR7ES... and after polishing my skills at changing plugs, still the same problem.

If anyone could help me understand this or refer me to a previous thread explaining this, i would greatly appreciate it.
 
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