I'm writing this so you can think about it and maybe see something I haven't. I have the EZ-EFI 1.0 with the color handheld. The SBC engine has multiport injection, 8 each 36# injectors. But there are two problems, maybe related, maybe not. 1) The engine seems to miss often at cruise. I suspected the EFI didn't like the tach signal it gets from the Mallory Max-Fire distributor. Here it is: Does this appear OK for the EZ to handle? But here are other snaps: Note the spikes! Could these be upsetting the EZ and causing the missing? 2) The other problem is the handheld resets a lot, and when that is happening the engine really isn't happy; stumbling at cruise, dying at idle. Here's the system info: Does that all look correct? And the settings of the system get scrambled! The fuel enrichments change, the injector size, the number of injectors, multiport gets changed to throttle body. What could cause such behavior? Do I have a bad handheld or a bad EZ? Do I need an exorcism?