Need an oracle! Low speed miss on cylinder #1 only.

[Ccmano]

Originally Posted by bmarcum

Great point on the oscilloscope. That sounds like a great Idea. What is best for the LT5? I have a friend of a friend that has a old Sun engine analyzer for traditional distributor systems. I don't think it would work for the LT5 but I understand your point. What set up is best for the LT5 to see ignition pulse on each cylinder?

Can't say I've used an oscilloscope on an LT5. A modern oscilloscope with an induction pickup (like on a timing light) that can be moved from wire to wire would be best. This YouTube video might help. Interesting to note that the guy talks about half a coil pack not firing.
https://youtu.be/Kr8TIc820SA
H

[32valvesftw]

Switch two coils and see if the "weak spark" follows the coil. Switch plug wires and check again for weak spark, then switch plugs same thing. Going back to basics, do all the plugs look the same in so far as color and build up on the plugs.