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Discussion Starter · #1 ·
I have a 89 mustang GT w/ the stock 302 block. It has an intake, a bigger throttle body and mass air meter, heads, a fms cam, bigger fuel pump, headers, and a battery relocation kit which are just the major mods. I installed a 6al box, blaster coil, adjustable rev limiter, and a msd harness. After intalling all of that my car misses under load anywhere from 1/4 to wot while I am driving down the road but it is fine when just revving it up. I am running a stock distributor, msd cap + rotor, ford racing 9mm wires, motorcraft plugs gaped at .060 and the timing is set at 12 degrees advanced. The box is mounted on the drivers side fender where the battery used to sit. It is grounded directly to the 4 gauge wire coming from the battery and the power wire is coming from the starter solenoid. I have rerouted my spark plug wires with a diagram found on a 94 ford truck which seemed to have help reduce the missing and I also changed the sparkplugs from autolites that were gaped at .052 and they looked good. But I can disconnect the box and the car runs fine. Other things I have tried is turning up the fuel pressure up to 49 lbs., unplugging the rev limiter, and disconnecting the battery for 30 mins to erase the computers memory. Also it seems not to miss as much when the car is warm. Any help is appreciated thanks, Bolinger
 

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try to run it with out the msd digital 6.......i have 2 friends right now and both of em have gone through 4 box's each....
 

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Discussion Starter · #3 ·
i have tried and it runs fine but i don't know if the box is bad or if my wires are arching. They are the ford racing 9mm wires and are only 4 months old. thanks bolinger
 

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ok i started my car up while it was pitch black in my garage and i could see my plug wires arching from the boot to the heads(it looks like the plug glows) and many other places along the wire. Also i could see the metal square around the coil arching. Does that mean the wires are bad and what about the coil?
 

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i would change the coil and the wires right away. mine did the same thing and ended up frying my box. my coild was shorting internally but it would only miss at 3000-5000 rpm. and those msd wire boots suck. mine arc as well. but get that taken care of, it fryed my box, and ignition control module.
 
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