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Old 10-06-2012, 11:20 AM   #5
nate_fisher
Scooby Specialist
 
Member#: 270482
Join Date: Jan 2011
Location: albany ny
Vehicle:
2011 turbotek fxt
11.85@117 4eat xt record?

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Its the fuel pressure regulator its a common problem with the newer sti's my friend had the same problem with his 2012 with a 2.5xtr. He installed a 2007 sti fpr kit and agency power parallel rails and lines and no more stumble between 2500-3000 rpm. To bad he fried his rings befor he got the chance to correct the problem. He put in new cp pistons and still had the stumble until he changed out the regulator and bam no more issues he is making 450whp on e85 now.
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