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ever sinse i bought this car almost 2 years ago i have had this problem with a hanging idle when i rev it up. if i rev it in neutral or with the clutch in it hangs up arround 25-2700 rpm's for a few seconds before it goes back down to idle. after the motor warms up it's not as bad but definitely still does it sinse i got the car i pretty much built the whole thing up, built 351 with many mods, tranny, rear end, suspension the thing is with the old 5.0 that was in it it was doing it so i figured the motor was just beat but it still does it with the 351. i was thinking maybe it was the ecu but i don't think it would make almost 400 hp with a bad ecu. anyone have any ideas? it idles fine at 750-800 until i hit the gas a little
 

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so its injected? maybe the tps,iac..maf sensor..
 
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