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Message: <blockquote data-quote="INW-Iron-Steel" data-source="post: 24410" data-attributes="member: 11733">A little bit more backstory for context. I have been chasing some issues for about a month or so on the 04. My wife was driving it and told me it was slipping and not shifting well at slow speeds. It would not do it for me, but one day it was so bad she couldn't even get the truck to move and reported a loud bang from underneath. We've got about 30,000 miles on the rebuilt transmission, so I figured something was going bad just outside of the warranty. Looking at the build sheet I noticed the shop had not changed the shift solenoids. So, new fluid, filter, shift solenoids and EPC solenoid. I was in there, so I also did a Sonnax pinless 1-2 piston.After putting it back together I took it for a drive and it finally did act up for me, and it was clearly a horrible misfire that was dropping engine RPM very low. I had my scanner in the truck but there was no engine light. No codes stored. I took a look in the GM enhanced portion of my scanner and found multiple codes.[ATTACH]3583[/ATTACH][ATTACH]3582[/ATTACH][ATTACH]3584[/ATTACH][ATTACH]3581[/ATTACH]P0154 also comes up as "O2 sensor no activity detected" when looking into these trouble codes. Then I got to thinking. The MAF on the truck was original with 270K miles, and the O2 sensors had at least 100K miles on them (I think my dad bought the truck with 155K and we did Headers/Y-pipe almost immediately). Looking at live data my fuel trims on bank 2 were also off. So, I replaced the MAF with a Delphi and the upstream O2s with Denso. The truck runs great, but now I am getting the heater codes for both upstream sensors that I replaced.I forgot to mention that I also addressed most of the major grounds in the midst of this fiasco. New negative battery cable and terminal end for the coil ground on the front driver side of the block. Cleaned ground from battery to chassis near the bumper on driver side and replaced wire going to battery. Removed and cleaned grounds on driver frame rail under cab.</blockquote>