Cterry2

No, I have been making sure to note this hoping to find some sort of correlation however it has done it cold or hot, first part of the drive or after driving for a bit. See I was wondering if this wasn’t a misfire however I have thrown not a single code so far through all of this. If it doesn’t go away as randomly as it came on I’ll probably go the route of tranny flush first then plugs.

I need to add a new symptom I am noticing. I have a tuner/gauge that shows my throttle percentage and whenever this hiccup happens my throttle with increase substantially from anywhere I am like 25-40% as soon as I feel it begin to hit that wall of no power I look down and the throttle is reading 75 to sometimes 99% without me moving the gas pedal at all. Unsure where the gauge gets this reading but thought I would put that out there. I wouldn’t think it was in the tuning as I haven’t messed with it, anything for that matter, and it just came out of the blue.

I’ve never heard of this tranny test, I’d be interested to learn more about that. It’s possible I have been altering the results although I have only been dragging out the symptom here recently to try snd induce a CEL. Thanks for the replay. Do you think your issue was fixed more by the plugs or granny service? Honestly I haven’t ever. That was next on the list as long as nobody was like “torque converter! Torque converter!” Then I’d have to refill with fluids anyways after replacing lol.

To start out a little background: I am in a 2014 GMC Sierra 1500 5.3 149,000 miles. I have been daily driving this truck for two years now and have put 35,000 miles on it. This issue is completely out of the blue and I am hoping someone similar has fixed this issue in their truck. So I am having an issue that it seems a lot of us have had with our trucks on here however out of the multiple threads regarding the issue none are recent nor have a fix that I can find. Starting about 2 weeks ago I felt my truck do this weird surge/misfire/trannyslip feeling whenever I was going down the road I didn't think much about it until I was going up the mountain the next day and it got a lot worse (more frequent) real quick. Well here I am a couple weeks later and this is everything I know about it. This feeling is almost like the truck is choking for power for a split second and then fixes itself and goes on about its business. Mash of the gas fixes it, downshift usually fixes it. It only occurs between 1500-1900 RPM but never whenever cruising at those RPM's on the highway on cruise. If I am coming from a stop then it will get through first gear just fine but at the top of second and usually the top of third it will what I thought was the tranny slipping for the longest time but it is just like the truck will hit a wall of power loss and it will only last 1-3 seconds. It never happens if I give it good gas only whenever I am around 25-30% throttle. From the other threads it seemed like mass consensus was that it was the torque converter however I read of one fella on here that replaced his entire transmission after a plethora of sensor changes and it still persisted. The only thing I have ben able to collect from the threads before me is that a tune HELPS make it less noticeable but not a single person has been able to make it go away completely. And it seems there have been a ton of yall that have experienced the same issue. It is throwing no engine codes, I even try to make it last longer sometimes by backing off the gas when it occurs to see if it will throw a code so that it will point me in a direction. This is a feeling felt by everybody in the truck. Stabilatrak off/trailer mode/manual mode, nothing makes a difference on it. Any tips/knowledge/help at all would be greatly appreciated.