Why does my 2006 300 Touring rev up then down at steady speed?
When driving at a steady speed, I notice the car revs up a bit then down. I can accelerate no problem but when it goes along at a steady speed, some times it will porpoise up and down. Why does it do this and how can it be fixed?
Could be a couple things. Clean your throttle body, and idle speed control valve, also check for vaccum leaks, clean your MAF. Might want to inspect your coils and plugs.
Also check fuel injectors, you might want to get a strong fuel system cleaner. Chrysler dealerships use BG products. BG 44K Fuel system cleaner and power enhancer this works really good. It also increases octane levels in the gas. I have used it a few times and have noticed better throttle response and bit more power, also increases fuel economy.
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