The fuel pulse is from the fuel held in suspension in a carb.
The FI doesn't completely eliminate it but it becomes difficult to detect.
The only fuel being held in suspension in a fuel injected car would be from fuel bouncing off of something in the intake inlet.
Otherwise the fuel injection shot is timed.
You really can't use any filters over ida's on an american v8. There will always be some overlap.
The key SEEMS to be to hold that to 28 degrees or less. Then you don't see the fuel plume.
Is it there? Probably.
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