e85 to 93 octane

bananatang

New Member
Feb 22, 2020
1
0
1
18
illinois
I switched my car over from e70 to 93 octane (have tunes for both). Since I switched the startups been rough and it idles at 250. I thought I had to much e70 at first but I drove around a bit and filled it up with 4 more gallons of 93 and it still does the same thing. Could my spark plugs be bad?
 
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