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I own a 98 Dakota Sport. 318 with @165000 miles. (Well taken care of as far as oil/fluid changes... general maintenance) When I first start it in the morning or on the drive home from work, it runs really rough. It idles fine but when I start down the road.... No power unless I floor it. What I would call normal throttle for driving at 25-40 MPH hour REALLY spits and sputters unless I give it a lot of gas. Once it gets to operating temp it seems to be fine. I need some ideas on where to start. Have changed plugs, wires, cap and rotor. Throwing no codes. Thanks in advance.