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I have a 5.0 H.O. motor from a 1991 mustang. F303 cam, aluminum heads, 1.7 rockers, typhoon upper and lower intake and 5speed. For some reason my rpms do not go past 3500 while driving. what could be the cause of this?
 

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I have a 5.0 H.O. motor from a 1991 mustang. F303 cam, aluminum heads, 1.7 rockers, typhoon upper and lower intake and 5speed. For some reason my rpms do not go past 3500 while driving. what could be the cause of this?
Rev limiter?
What EEC mods are you running?
 

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did it just randomly start happening?
 
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