I've got the car running again, but get a surge / miss on light throttle cruise between 2,000 and 2,500 RPM. There's also more exhaust 'popping' or 'burble' on throttle-closed deceleration than before I replaced the ignition box and coil. There are no apparent issues at idle, when accelerating, or cruising < 2,000 RPM. I have not yet checked the timing but, other than replacing the magnetic pickup and distributor cap, the distributor was not touched.
Environment:
- MSD 8477 distributor (magnetic pickup swapped from old MSD 8577 distributor in process of getting car running)
- Summit Multi-Spark digital ignition control box p/n , mounted behind dash ( https://www.summitracing.com/parts/sum-850610 )
- Summit Epoxy coil ( https://www.summitracing.com/parts/sum-850500 )
Questions:
- Does this sound like an ignition or a fuel issue?
- Where do I start?