I have a 92 B2200 w/ 130,000 miles. The check engine light came on and a week later when i started the truck the engine raced really high. the tachometer showed 4-5, as soon as i started the vehicle, so i shut it off. Subsequently, i chnage the carburator, fuel filter, air filter,checked the vaccum lines and throttle cable. nothing has worked thus far. as soon as you start the truck it seems to be stuck in high. does anyone have any suggestions. thx.
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