My 2006 sti was hesitating under boost and would break up around 4800-5000 rpm, I figured the plugs were bad. Before I got to change them I was driving home on the highway, slowed down turned and when accelerating from 4th to 5th I heard a slight pop on the passenger side and my car began to stall and die, I couldn’t keep it idling and eventually stalled and would not start, I thought fuel pump went. I changed that from my 04 sti it had a warlboro 255, installed pump seemed to run well, managed to get the car started and it ran well, for about 15-20 seconds (when the pump duty cycle fell from 100-33) it began to cough and die once again. I could keep it running barely by constantly peddling the gas pedal, but would not run on its own. I changed the relay under the glove box, issue remained, swapped the for (oem) from under the intake and issue remained unchanged, same result. At this point I have one more to check I believe the fuel pump controller ? Just not sure if I’m wasting my time on that, any and all advice or tips would be great. Like I said it runs fine when pump is at 100% duty cycle, then once it drops from high idle to 33% the car begins to lose fuel and dies, that’s pretty much it for info thx again hope you never have an issue as annoying
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