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1997 GMC Suburban 1500 Questions

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I have a 1997 gmc suburban 5.7L. It runs rough when I start it and almost dies when I put it in gear. But it seems to run ok as long as I’m giving it gas but as soon as I let off it starts running rough again
What's the name of the part over top of the tail light in a 1997 K 1500 GMC
My truck doesn't bounce all the time, only over certain bumps in the road, in certain areas.
It doesn't grind all the time and doesn't seem to happen at any particular time. Random.
its been making this horrible popping for about 3 weeks and getting worse, what is it and how much to fix?
Won't start if left off for more than two days. Once started, starts again first time every time within 2 days. Then won't start unless jumped and gas pumped repeatedly. Battery always checks out good. Dealer says no drain on battery, no codes on computer. Engine runs fine.
Check engine light has been on for 12 years - truck runs fine and passes emissions, but CO now requires no check engine lite. No codes on computer - dealer and repair shops can't fix.
Could it be altitude - how to reset computer?
When these stopped working the transmission stopped down shifting. I can manual shift but it takes off in second gear. This happed once before and I only had to restart the truck to fix the problem. But that doesn't work this time. I have been told trans speed sensor or engine module may be the problem. Does any one know?
I have replaced both shift solenoid's,the code keeps returning
i tested both solenoids for continuity , they are within the specific range. the code is erratic, sometimes it goes off continuously and other times it doesn't go off at all. PO758
Also burped cooling system for 30 min at 2000 rpm Any clues why?
Took truck to advance auto where they connected diagnostic handheld. Code P0161 came up. Bank 2 ,sensor 2.
Wear and tear like driving down bumpy road? Can it be welded back up and repaired cheaply? And popping noise as started upon coming to a stop.
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