Hmm. I should do what I was thinking of doing a while back. Build a carputer and have a 7inch touch screen with Windows 8 running.
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I'll have a guess for what it's worth
drive by wire right?.
bad earth or power in accelerator switch.
have the same problem in works mitsubishi truck, dealers had 3 looks at it now ( dimb-foundered ).
yours has a hand throttle adjuster?, I can make mine play -up just touching that with tip of pointer finger.
humm good luck.
money's on electrical gremlin.