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the chance of a fpr being a problem is like 0.001% or less. I mean its down there.
Much more likely fuel pump if there isn't an air leak.
You DID eliminate closed loop right, unplugged the O2 sensor
meh Im betting the "new' fuel pump is giving trouble. Bet the line has a hole or the sock fell off. Or it was a chinese copy and failed. One of that is far more likely, actually double since you were in there recently
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