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This may not be much help, but it sounds like there is a vapor lock. that is, there be be a venting problem causing a build up of vacuum and preventing fuel flow to the engine.

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โˆ™ 2005-09-06 00:15:11
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Q: When you remove the gas cap from your 95 tracker it has a strong vacuum and it runs rough till you open it what do you think?
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