06 m7 firing on one

RUDY

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Fort Saskatchewan, Alberta, Canada
I am confused and don't know where to start the 06 M7 EFI isn't running that great.I took it out and ran good for a bit then it starting acting up.You can hear it running on one and when you get to a higher speed you notice 2 right away.
I had in Manitoba and yesterday to the bar i'd only get maybe 70 mph
I just unloaded it and sounds like it's idling on 2 but when you take off it's just one.Changed plugs,used the APV synethic oil,i dunno where to start or what to do.
Oh i dunno if it is a big deal but in MB they said they that 87 octane has 10% ethanol ,89 has 5% and 91 has zero,would that cause anything?

Can anyone help me out?Heading out to Vegas Mon. and need it fixed by the 22 wanna hit the mountains with it.

Confused,upset,peed off
 
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