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Need some help - EVO IX RS boost gremlin?

Motor Sports - evolutionm.net - forums.evolutionm.net
At COTA on lap one, my perfectly good EVO IX RS decided to start caughing, burping, and flubbering just as boost was coming on? Boost leak right.....wrong. Nope. Pulled spark plug and the one we pulled was broke. Gapped and replaced all with new plugs. Same problem persisted when getting on boost. My day at COTA was done. Car idles and starts fine. Accellerates fine off boost. Got hom 2 days later and tested gas. It was e92....not e85. Ahhh, I must have put in e100 by mistake at pump before putting car on trailer. Sure enough, drained gas and car runs like it should with correct e85 fuel. Did this for 2 test rides on different days and the car was perfect again! Problem solved right? Wrong. Nope. Car acted up again tonight and it's doing that same thing on boost again where it cuts out and flubbers and flashed the yellow engine light.

I am stumped. Anyone? No leak under boost leak test.
Date: Oct 12, 2017   


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