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The proof that it didn't work could be that I was stranded at 11pm two hours from home
Are you trying to say you're a glass is half empty kinda guy?
So dont put yourself 2 hrs from home at 11 pm, till you know you have confidence you solved the problem! Do I need remind you of the age of your car and almost any of its critical systems can have a failure that may leave you stranded?
I'll change my dme, examine the old one and stay close to home for a few runs.