ECM code 36?????

[Dds1990]

Took my 90 out for a drive yesterday and it ran great....no issues. Possibly made a mistake. I usually run Shell 93 octane in it and fill it up after each drive. I was not close to a Shell so I went to a nearby Harvest Land Coop. I saw that they had 91 Octane Ethanol free so I put about 4.5 gallons in it. Ran fine the 5 mile drive home. Took it out again today got about 3-4 miles from home and had the SES light came on briefly 3 times in the first 6 miles then no more. But the secondarys would not work. I drove it for about 60 miles and then put 3.5 gallons of Shell 93 in it. Could it be the gas or something else??? It had new injectors installed in June. Used Cliff's code reader and got Code 36 from the ECM.