I had the same thing the first shaft lasted a lot of miles (with the hivolume pump) unfortinatly I replaced the shaft and dis gear numerous times then.......the pump
I would bet the pump is a hi volume, replace the pump with a stock pump put in a new AUX shaft and a Dis gear.
Then find the running problem I also think it is the VAM or a bad hose before the turbo
My
2 cent
I would bet the pump is a hi volume, replace the pump with a stock pump put in a new AUX shaft and a Dis gear.
Then find the running problem I also think it is the VAM or a bad hose before the turbo
My
2 cent

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