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I just finished troubleshooting what may be a similar problem. Hard starting, shudder and shake. See my post about 1 month ago. Turns out it was the gasoline. We get our fuel from a station close by. Always the high octane. The solution fell into place when we took a long road trip and filled up at a station miles away. The problem completely dissappeared. I guess we kept filling up with the same junk for 3-4 weeks. Makes sense it would take that long for the ground tank to run out - costlier price.
Hope it turns out to be that easy.
Jp
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