Problems with ECU

[ctreser]

I had been using a orange box with my 66 coronet with a well built 440 using a blaster2 coil. It wants to fall on it's face at anything approaching 6k otherwise runs good. I then decided to try a new chrome box, mind you all I did was change boxes. Now, it runs strong over 6k but misses or at least feels like its missing between around 1500- 3000 rpms. Was wondering if I needed to change something else with this chrome box. Any guesses. Thanks

 

[nm9stheham]

Is the stock ballast in place and known good? That needs to be in place for this coil.

When the car is idling, put a voltmeter on the dark blue wire feeding the ballast resistor (with the voltmeter's - lead on the battery -) and see if the voltage is within a few tenths of the battery + voltage. If you have a large voltage drop to the ballast, then this will effect the ignition performance.

And make sure you have good grounds for the ECU.