We were working on a Mustang 347 SB ford. This car had the engine in and out several times with what appeared to be detonation. The car was just hi maintenance. He was making around 1200 RWHP revving the engine to 9500 RPM. He was using aftermarket engine management, MSD flying magnet, Distributor and a digital MSD box. Engine pulled clean made good power. Sometimes out of the clear blue sky would start to miss. Pull spark plugs and signs of detonating on different cylinders. Was never a uniform problem. The engine problem was never in the same cylinder. After being convinced that another engine management would fix this problem because they had the better deal he swapped. Problem did not go away. After installing many Electromotive systems on Cobras I was talking to them on the phone and they told me about a spark scatter problem with 3 tooth triggers and systems that would resync every 720 deg. We loaded up the stang on the dyno pulled out the timing light and pulled the engine to around 9000 while watching with a timing light and there it was. Timing was floating all over the place. Then it hit me The timing light only shows the number one cylinder. We put a scope on the car checking all 8 cylinders and thats when we really seen what was going on. The timing would vari on the other cylinders same as number one. Sometimes it would go off the scale 10 degrees or more. The engine never once sputtered. So after replacing the crank trigger and new box, distributor, wiring harness took every precaution to prevent noise nothing helped. Electromotive offered up a system to test. We installed it problem was gone. Not at any time with this system did we see a deg of variance. The guy bought the system. The car ran last to years with no more mystery issues. What we found is that when the system would miss a trigger event it would allow the timing to go out. It might happen with the entire firing order or just a single event. Never the less the problem was there. We had a total of 4 systems on the car including my personal favorite 3 of the systems had some degree of spark scatter issues. The funny part was you never would have known it. The car pulled clean made good power. They just thought they were hurting the engine because they were pushing it. They would pull timing lower boost but still had small issues. After the problem was corrected they could really lean on the car. I was sold to say the least. I was wondering how many engines have been damaged from this issue. Even more disturbing is some refuse to believe the issue exist. I am not a big fan of the TEC software. Its workable. I am sold on the ignition.