.....If I drive for more than about 20 to 25 minutes at a stretch, my van starts to lose power, almost like it's overheating. ......... This sounds much like 'Vanagon Syndrome' , associated with the AFM and a confused ECU. When this happens try pulling over and shutting off the ignition but only wait a minute or less, then try to restart. If the engine then runs normally you are probably dealing with the Syndrome. There could be other problems (already covered by other posts). |
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