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not running good at times ; misfire and chugging/shaking

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Old Nov 25, 2016 | 05:09 PM
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Default not running good at times ; misfire and chugging/shaking

1997 ram 1500 with 318. Chuggs real bad for a couple weeks then it will run fine for a week or so and then it will chug and run bad again. Shaking really kicks in around 40-50 mph range. Check engine light will blink when in 40-50 mph range when not running good. Plugs, wires, cap and rotor are good, cat convertor is good just had a new one put on about a month ago. any clue to what the problem could be? one shop I took it to says it could be electrical problem but doesn't know what. when hooked up to the scanner it brings up misfire codes on all 8 cylinders. Been doing this here and there for about 6 months now but has occurred a lot more frequently in the past month or two. Any help or ideas are appreciated, thanks!
 
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Old Nov 25, 2016 | 07:17 PM
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when hooked up to the scanner it brings up misfire codes on all 8 cylinders.
Blown plenum gasket!!!

http://www.hughesengines.com/Index/p...p?partid=27091
 
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Old Nov 25, 2016 | 08:06 PM
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And bad O2 sensor.

Welcome to DF!
 
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Old Nov 25, 2016 | 09:06 PM
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Hopefully not a clogged cat too...
 
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