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Old 03-04-2012, 12:35 PM
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89 454 C3500

I have a 89 454 C3500 Dually and runs great around town but when I throttle up it craps out and wants to backfire.. Was told could be module in distributor.Does any one know the problem, I installed new MSD wires and and coil & plugs. Runs great when I don't throttle up..

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Old 03-04-2012, 03:00 PM
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Usually if it runs out of spark it'll start popping through the exhaust, and not just one now and then, it'll sound like popping corn.
If you mean just one backfire is it coming out of the exhaust or out of the carb? If it's running out of fuel it can cause a very similiar problem.
Is the TBI still present on the vehicle?
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Old 03-04-2012, 03:05 PM
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89 454 C3500

Its getting plenty of fuel,back fires out of TBI. under power.. Thanks for your responce..
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