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Ok, after a long drive truck got bad enough to through a code!!! Open circuit fuel injector cylinder 5. I was out in no where Texas when it did. Me being a chevy guy all my life, i opened the hood and started looking at problems on cylinder 3. Could not find anything wrong so I limped it...

Thanks for all the info, it does it in 6th, all temps are norm, no high gauges. It does feel like a coil to me, just does not sounds right if it runs good when I hit it...but maybe. I guess I need to pull plugs and see what they look like next....was not looking forward to that. O2 sensors...

Purchased it used 9 months or so ago. This is new feeling. It is a weird skip/miss. My wife thought I was going over bumps when I asked her if she could feel it.

I had a code a month ago for bad CAT or O2. I cleared it and it never returned. Just to be sure I swapped all O2 sensors yesterday, weirdness still there. I also removed the K&N filter for standard and but some injector cleaner in this last tank.

When cruising at around 60-70mph on highway and you give a slight gas it seems to miss. If you give a good push, it is ok. It does it only when low RPM high gear cruse. 2012 SCREW with 143,000 miles on it.

I too had a leak and have been looking for after market Y-Pipes with cats for our trucks. I only see ones for long tubes. Are there any after market y-pipes that work with stock manifolds?