Question about 2004 Chevrolet Silverado 3500

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I have a 04 3500 silverado 8.1, if I step on the gas at 45 mph it begins to gallop for a lack of better words. Also the tach is stuck or reads incorrectly.

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You have a short or loose wires around coil pack. check all plug wires and electrical conectors and clips

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My 1993 Toyato Camry won't go over 45 mph when it wants to. Some times it runs over 45 and sometimes it doesn't go over 45 mph. It has 82,000 miles. I have changed the Fuel filter, I have checked all the...

Worn out & blocked Exhaust Converter

That would be about 80% of the possible reason
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I hope your were doing all your own work &
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I would hope you did not pay for that lack of
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Normally I would say you have a basic cylinder miss. The engine is under the most load when the transmission shifts into lockup or overdrive.
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Dodge ram 1500 studdars a little bit between 35 and 45 mph

A misfire on # 8 Cylinder which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. 
There are other possible, less obvious causes as well. 
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
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I would get the Dyno tuned and see what the computer is reading 35 and 45 MPH. or you could check with your local dodge dealer to see if there was a recall or update on the Computer if there was or is any issues. 
Good luck and hope this helps, Old School was so much easier.

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