I've had the same problem with a Lrp tc sphere speedo if you turned the steering left or right it would make the car stutter and lurch forward.
I only ran this speedo from new with a power cap fitted and a Futaba 2.4 receiver and Savox 1258 servo. And tried to move the receiver around the car and re-route the wiring so nothing touched but would cure the problem for a heat or two but still would come back again.
But then two weeks ago it got to the point where if you turned the steering the car would drive forward without me touching the throttle. And the only way to stop it was jamming on the brakes so checked all my settings on the radio and all okay so thought it had to be the speedo so gave it a run in practice and that's when I got the smell of burning and since then I've taken the speedo apart and near the fet's there's a small part that's burnt out so guess that may have caused the problems to start with or something else has caused it to burn out.
Since then I have put a speedpassion speedo in the car to check to see if it wasn't the radio gear at fault and no problems what so ever.
So may be worth trying a different speedo or getting someone to check the speedo out to see what the problem maybe.
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