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5.0 breaking up at 5K rpm, please help


pontiacfreak142

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Basically we put a new cam in my dads 5.0 mustang the other day, because the one that was in it (it was in the car before we bought it), was to big for the setup. With that cam, we shifted the car at 5800 rpm with no problems. Now that put a new cam in, which is smaller, the car starts breaking up really bad at about 5000 rpm. Any idea's? We have tried adjustimg fuel pressure, new spark plugs, and a new coil. the miss kinda feels and seems like something electrical but not sure. Nothing else was changed on the car but the cam.
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even if the cam is smaller,the spring pressure could be very different(higher needs), do to cam angles, etc.

 

thats or it just time for the springs..but hard to tell.

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if you have the dizzy a tooth off it will do this. or you put the cam in a tooth or two off. i got a sbf with no dowl pin in it once and it ran like crap becasue the cam twisted.
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