I have a problem that's getting worst with my 70 Barracuda, it has had a very intermittent miss & as strange as it sounds it is mostly when I have either left or right turn signal going either at idle or highway speed it seems to cut the ignition when I use the turn signals! I'm wondering if I have either a crook earth or a poor power feed maybe? This car has run fine for years & there has been no repair or modification to the wiring in the last few years that caused this problem. The car is a factory 383 auto car that has had a Chrysler electronic ignition fitted about 10 years ago & ran perfectly fine until a couple of months ago.

Any ideas?