If the oil pressure came on at idle maybe your oil was really hot and thinned out? What was your water temp gauge reading?
Misfires could cause shaking and a flashing CEL, did you see any aos type smoke bombs? Maybe because of the tunnel you didn't see it?
Do you have a durametric or a way to see if you have any stored codes?
You can change the oil filter and cut off the ends of the old one and spread it out to look for any debris?
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