the pipes sound the correct way round, inlet to rail, but the et is common to have fuel pressure reg problems, ive had 2 go so far, stock fuel pressure should be about 36 psi at idle. my first one was fubbered running at 60 - 80. try and get a gauge on it to test. no sense changing it if you dont know its nackered.
else it could be air flow sensor, timming, erm ecu, thats me out of ideas.
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