My truck has about 48k miles on it and for the past few weeks, every time I go 60-70mph my truck gives a blimp of the gas/ vibration sound. The only reason I know this is because i heard it from the Magnaflow side exit exhaust I have. I'm wondering if it's an exhaust issue, tranny issue or engine issue. The truck shifts perfectly fine but just has that small little blimp of the throttle every once in a while at those speeds. Note: the Rpm gauge doesn't move but my mpg gauge dips down verreeeey slightly but goes back to my average after the throttle blimp is complete. I know it's not my foot pressing the accelerator down because it does it on cruise control as well.
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