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I have the same problems and a local mechanic told me my O2 sensors were bad. But he couldn't locate a few readings so I never let him finish the job. My van will suddenly bolt and shift into a lower gear when driving, this is followed by the speedo dropping to 35, even tho I know I am going near 65 mph. Only happens when it rains and first noticed in Florida during a downpour. I pulled over at a service station, the tranny was running real hot without scorching and the fuild read low. I added more and the problem seemed to fix itself, but upon checking, like I said,
the O2 sensors were bad. Talked to several mechanis who couldn't agree whether there are 2 or 4 of them. Good Luck!
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