Car won't go over 25 mph

1998 MITSUBISHI MIRAGE
200,000 MILES
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MRANDMRST
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Why is my car acting so weird. It runs well for a few days and then it starts to sputter and it won't go over 25 mph!!!
Sep 11, 2012 at 9:42 PM
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SATURNTECH9
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Any codes in the computer?
Sep 11, 2012 at 9:57 PM
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MRANDMRST
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Nothing shows up on the computer. We have put it on the diagnostics machine several times and each time everything checks out normal. This has to be an issue that can't be detected by a diagnostics machine.
Sep 13, 2012 at 2:20 AM
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SATURNTECH9
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When it has the issue do you have to let up on the gas for it to shift?
Sep 13, 2012 at 2:55 PM