[Marotte]

Any help would be greatly appreciated:

Car: Superformance Cobra MkIII #2137
Engine: Roush 427R
Ignition: MSD Digital 6 Plus

Sometimes my engine almost dies.
The tachometer goes to zero, but the rest of the electrical works. If it's happening while at speed, the engine keeps running, but much softer. If stopped, pressing the gas pedal just products a lot of loud bangs at the exhaust, but the engines doesn't rev up.

It goes aways after a while, and happens seemingly at random times.

Any idea ???