It's not the pedal, it could be the TB
Have it checked out by a repair shop. I think your the first guy to post this problem.
195k, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here