fastbee Posted January 9, 2016 Report Share Posted January 9, 2016 Yesterday I set my cruise control to 40 mph on a stretch of highway notorious for speed traps. I don't recall every setting it that low before. Almost immediately the truck started to buck and jerk, almost like it was coming in and out of gear. It settled down when the throttle came back in but started jerking again as soon as it came off throttle. Today I got on another long straight stretch and tried various speed settings. The truck had the same reaction at any speed above 35 mph. At 60 mph it felt and sounded like something was about to come apart. The bucking/jerking is triggered when it comes off throttle. I can push the gas pedal and it will settle down or use the cruise control controls to add speed. As long as increased fueling is being commanded it seems OK. It should be noted that there are no issues when not using cruise control, it runs fine. Anyone ever heard of or experienced this? Quote Link to comment Share on other sites More sharing options...
cadowns Posted January 10, 2016 Report Share Posted January 10, 2016 What are your Mods? Does your torque converter lock properly ? CD Quote Link to comment Share on other sites More sharing options...
EXGM Posted January 10, 2016 Report Share Posted January 10, 2016 Do you have a check engine light? I would look at your throttle body. If you haven't ever cleaned start there. Quote Link to comment Share on other sites More sharing options...
fastbee Posted January 11, 2016 Author Report Share Posted January 11, 2016 cadowns - truck is tuned and has a cam and custom exhaust. Converter seems fine as it drives great as long as cruise is not being used. EXGM - No CELs, not even any soft codes according to my scanner. Would the throttle body cause issues only in cruise? Quote Link to comment Share on other sites More sharing options...
EXGM Posted January 11, 2016 Report Share Posted January 11, 2016 Possibly if your is the drive by wire. I would take a look I bet it's all gummed up. Quote Link to comment Share on other sites More sharing options...
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