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Mystery misfire/running rich

804 views 4 replies 3 participants last post by  w0nderbr3ad 
#1 ·
So I bought this 240sx with the thought maybe it was just a fuel pressure regulator but that’s a hard no, I replaced it and nothing changed. I also unplugged the maf and the idle cleared up but still backfired down the intake a little when the throttle would actually respond. It backfires and just idles really bad
 
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