Was out in my car the other night and i launched from a standstill in first up to the red, into second and straight up to the red again, then i braked, as the car was slowed to about 20mph the revs dropped until it almost stalled and i lost my powersteering for several seconds... Does anyone know what this could be?

 

The engine was not cold, i had been running it that night for maybe 4 hours previous...

Probably part of the idle assembly. It maybe stalled (lost power steering) and then it jumped itself back again. You can buy the idle assemblies as a unit, its on the rear passenger side of the engine. They get full of gunk. Other possible causes are gunked up throttle bodies. They let a small amount of air through when the throttle is fully closed to keep the engine running, this hole gets gunked up. Easy clean with some brake cleaner.

Hi mate

 

I had exactly this problem and it seems to be quite common... do a search for the Idle Air Control Valve or IACV.

 

Mines in bits in tha garage at the mo a replacement from Zedworld was 40 squid plus vat.