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On the front side of the throttle body on the left side is a air valve with 2 tork screws. Remove it and clean the carbon out with gumout spray or replace it. That is the fast idle valve. that is why when you start your engine it revs and idles down.
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What are the Merits and demerits of the plates?
Pro: you are able to change gear when your engine revs are different from your transmission revs. Con: when torque is high or the difference in revs (see above) is too big, it will slip.
What are the merits and demerits of plate clutch?
Pro: you are able to change gear when your engine revs are different from your transmission revs. Con: when torque is high or the difference in revs (see above) is too big, it will slip.
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turbo
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Replace the TPS (Throttle Position Sensor).
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try the idel air control valve
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Vacuum leak?
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When i had this prblem it was my mass air flow sensor check the wiring and clean the sensor its an expensive part if its bad put simple to replace
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