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Thanks everyone for your suggestions and help. I finally fixed it and will leave it here in case helpful to someone else. I’ve been chasing this issue for a year. I’m not sure what the original problem was. Maybe distributor or coil. But ultimately I think I fixed that early in my...

Great observation. I have not put an ohm meter on it, but that is worth trying. Yes, that is some rather new paint and I became concerned about that too. I added a ground wire to ICM and carried it to a wiper motor stud and then to the intake manifold. Used additional star washers to get...

I really appreciate the help and perspective. I downloaded the file from SD card and emailed to Holley. They said it could be a bunch of air getting in or a valve train issue. I've replaced lines and don't see air being a possibility at this point. Made sure things were tight. I'll try...

I had the dist dialed in before I changed it (35 degrees total). Problem now is that I can only set initial timing because it doesn't run when warm. I'll play around with this though and see if I can get a change. I appreciate the response and assistance.

No fault codes. AFR readings are around 13 while running. When you rev it, you'll see them jump to 25-30 for a split second. Tried replacing O2 sensor and moved it up on the exhaust pipe about 6" after flange with stock manifold on passenger side. Sent data logs to Holley. they think...

Thanks for the insight. I have replaced everything on the ignition side, coil, distributor, ignition box, voltage regulator, ballast resistor, but it acts exactly the same. The air fuel ratio reads around 13 when running. If you give it a good rev it will jump real high into the 20's and 30's...

The pump pushes like 90 lbs and then it’s regulated at the EFI to 58-60 lbs with a return line. I think you would just need to hook up a new pump or attach a device that drops the 90 to 7. Definitely would be nice to rule in or rule out the EFI.

Worth asking Holley about. Thanks for the suggestion. I have been reloading the start up settings, so I think they would be resetting.

It’s always acting up. Can you explain how to test that and what parameters are?

I’ve read and heard a number of different things. I’m no expert. Stock sticker indicates 2.5 degrees. But it ran well for years there. No change to motor.

Haha @Holley. Yes, I can see fuel coming in all 4 ports.

Yes, injectors seem to be fine. Sent in to Holley and they said it tested well too.

thought about that, but sold the carb long ago. Would require some effort to change pump, lines, etc. to get it carb ready again.

I've been chasing a problem for months. 1970 charger 440 restored fairly stock. 3000 miles since rebuild 440 and restoration. Stock manifolds, electronic ignition, but changed to Holley sniper EFI after problems with vapor lock. Atermarket AC. Car ran great for 2 years, then one day it ran...

I had some problems with my oil pressure gauge and figured it out with some help here. I rebuild my 1970 charger and in the process thought it would be a good idea to replace the oil pressure sending unit to a new shiny one. The new motor never had great oil pressure. I changed the pump with...