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At a loss with a boost problem


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My car has been getting to boost then stalling out unless I downshift. I've replaced intercooler piping from throttle body to intercooler and from intake to turbo. It seems like a leak but not sure where from. The weirdest part is if I re add the tune and the ecu is reflashed it goes away for a while but always comes back. Does anyone know what this could be I'm completely lost and not ready to take to a shop and lose more money.
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If it works okay for a while, then comes back, it has to be something that the ECU is learning. That means most likely timing reduction or fuel trim. Pull a live view(opensource) or take a log(COBB) like m sprank said and I bet you'll have your smoking gun.

MTBwrench's Stage 3 5EAT #racewagon 266awhp/255awtq @17.5psi, Tuned By Graham of Boosted Performance

 

Everyone knows what I taste like.
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