I'm sure I remember reading about very similar problems on here in the past, so I'm hopeful that someone can give me some likely cuplrit(s) to save me some time trying to fix it. I've tried the search function, but it didn't turn up anything useful

I was out in my car last night, and intermittently when it comes on boost it basically dies. At the same time, the rev counter shoots past 7000rpm

I'm thinking CPS or Phase Sensor - surely it's got to be related to the ECU's speed calculations?

Can anyone help?

Neil.