once upon a time when i used to race, i had a similar problem in that when the car was stationary it would be very twitchy, when i opened the throttle the car would launch off down the track then take an immediate right turn into an immovable object usually after about ten yards.
turns out i had a knackered set of crystals and after a swap to another set all was ok, just to check i put the dead ones back in and sure enough it did the same thing.
might be something to look at if it's vintage leccies your trying to suss out./
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