my throttle valve cable snapped..but does alright till 3 and 4th gear....i need the car to make an emergency run to south carolina from florida...if i get the caro n the highway...will the car force itself into fourth gear or will it continue to bounce back and forth between gears as it has been doing at 45 or so mph..?

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1984 Fire Engine Red Pontiac Firebird...2.8L V6..173CI...2BBL Carb..15 inch wheels..o.o