4A-GE MK1 Engine Check engine light only at 55+ mph

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Hello, I bought this 85 MR2 a few weeks ago and now it has started giving me a check engine light whenever I get over 55 mph. I hit 55 at about 2.5k in 5th, so I held it at 2.5-3k in lower gears to see if it was the rpm or speed that was causing it to come on, looks like the speed. I stopped at O