Karts Problem, engine cuts out

I'm getting back into RF2 after a long time away, better UI helping (although virtual mirrors NEEDS to be in the UI and not a player file edit!).

Been going through the load of cars and tracks I'd amassed before (free content and mods). Largly very happy (road Atlanta YAY!). But I can't test the Karts much at all because the engines keep cutting out, it's like the idle is insufficent to keep the engine running. If I hold the throttle and start the engine I can get going, but if the revs drop too far the engine dies again. Can anyone advise a fix?
 

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