6.2 intermittent rough idle. Valve spring again?

[calgator73]

My truck failed at 197 miles due to a broken valve spring.  One of the things I noticed the day before it left me stranded was an occasional miss or stumble at idle in gear.  Same issue with idle quality starting up again.  It's not occuring with every drive but it is happening more and more frequently.  Might be preemptive and take it in. 

[1997SierraSLT]

sticking lifter perhaps?

[RLW59]

If they did not replace all of the valve springs per the TSB, I would take it back, and insist they follow it. I had it happen twice while driving, after second time, I refused to pick it up until they did. They found 3 more on the other bank.

I could really feel the coming failure, by lifting a little between 45-55 MPH, and then softly pushing the gas, slight miss could be felt..

 

Good luck!!