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Message: <blockquote data-quote="Terrorist 5.0" data-source="post: 1589708" data-attributes="member: 30689">Well if it is only when warmed up, that sounds like it isn’t happy in closed loop. I would try unplugging the O2 sensors and see if that changes anything. A vacuum test couldn’t hurt too.I had a really weird issue with bucking only while in 4th gear and off throttle. Turns out my HVAC vacuum line was severed. Chased that for almost a week if I recall. Really confused me why it only happened in 4th gear.You could probably find my posts on it if you deep dig enough just to see how puzzled I was lolAlso, I’m surprised nobody has mentioned a code scan yet? Unless I missed that part.</blockquote>