I have a problem with the GM HEI setup.
The engine starts fine with bypass disconected and the cam signal is clean. But when i reattach the bypass the engine cuts once in a awhile. I have checked the ignition signal output with the osciloscope and without the bypass its clean, but with the bypass concected its erratic. Cheched it with two arduino boards. And somtimes after i burn a crucial option that reqires a adruino shutdown the ignition signal dissapiers almost completly. I have to reburn the controler a couple of times to make it work again. I have checked it on two latest firmwares and its the same. And the output from the ignition controler IC is about 2v but on arduino pin its 5v.
Some wlep is required.