This may sound a little hair brained, but bare with me, I am still doing some trial and error to try and figure it out. I have noticed lately that when I get down to around a quarter tank of gas it seems like my truck runs like sh*t. So I have really paid attention to it in the past few days. I ran it down to right under a quarter tank and did some WOT and just really paid attention to the throttle response and everything. Then I put gas in it and brought back up to around 3/4 of a tank and it runs totally different, better it seems. Junk in the gas tank? I just put new injectors in it maybe 5000 miles ago, so I wouldn't think those are the problem. It has right at 140,000 miles and I haven't done anything with the gas tank or fuel delivery system. I keep 93 octane in it because of the tune and occasionally run injector cleaner through it, but haven't since I put the new injectors in. I have been noticing some torque converter chatter at light throttle (see this thread, http://www.ls1truck.com/forums/mecha...-question.html) and noticed that it goes away when I put gas in it, any connection there, or am I just delusional? Any ideas? Any comments would be appreciated.

'05 CCSB Z71, 5.3, tuned, LT's, 3" exhaust, built 4L65E, TBSS intake, LS2 injectors, 90mm corvette TB (P&P'd), 150 wet kit with plate, MSD 8.5 wires, NGK TR6's, about 2 degrees timing pulled for the spray