Fuel or spark issues can cause this . Transmission lockup clutch can make a chugging sensation . When in overdrive lightly touch the brake while keeping a steady throttle and see if the chugging stops . Post back .
SOURCE: Chugs, acts like it's not getting gas once warmed up. Idle's fine
This problem can be several things. When your engine is cold, your computer is in a "closed loop" and just pretty much keeps the engine running until warmed up. After reaching operation temperature, the computer starts reading all the sensors. If one sensor is not connected or is defective, you will experience performance problems. Most of the time this will turn on the check engine light, but not always. Second is the fuel pump. This too will cause erratic engine problems.
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