it's giving me code 998, dds, what does it means and how i fix it?

1993 FORD TAURUS
150,000 MILES
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LUISRA
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when i look up for code 998 fails in ect/act/maf/tpr circuit can you tell me the meaning of each one thanks
luis bello
venezuela
Apr 24, 2012 at 1:34 PM
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RASMATAZ
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What exactly is the car doing?
Apr 24, 2012 at 2:15 PM
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LUISRA
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when you start the engine it stay acelerate and when you shift to reverse or drive turn off the engine and also as it's acelerate it give a hit sound in the drive train
Apr 24, 2012 at 3:54 PM
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RASMATAZ
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Check the idle air control valve, throttle position sensor and for a vacuum leak
Apr 24, 2012 at 4:06 PM
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