EasternSierraCQ

I have a 1999 Sierra SLE 5.3 LM7 (with the cable linkage to the throttle // not electronic FBW ) It has 240K that has been a great truck at least in terms of the engine and drive train other than having to replace the knock sensors TWICE! (GM sends these out totally unprotected and wrapped only in a sealed plastic sack which leads me to think many of them get dropped prior to destination and application) I recently started having a sticking excelerator when the throttle was in the closed position. First I determined there was no linkage sticking and thoroughly lubed where necessary. Then after reading about how common this issue is (even when new for some) I cleaned the throttle even though there was no indication of sticking when owning and closing the butterfly. This left me to believe there might be an issue with the two sensors - especially the TPS, and once I studied their individual movements it made me think the only thing remaining to create a sticking point was the TPS. So. I replaced the throttle position sensor and the Intake air control. I thought the issue was solved but soon the idle was starting to very and at high elevation it even stalled once. Doing little more research online I become aware of the learning procedures that need to be adhered to to reset the ECM AND that I had purchased some very questionable sensors relative to price anyway so I upgraded, doing so following the learning protocol. To no avail. This time the idle would climb to 2600 and I do NOT what to put it in drive with this kind of RPMs - which is what I would have to do if I wanted to drive it over 44MPH which is the second half of the protocol. I also do not want to buy a high end OBD2 that allows you to set the idle. Is there anyone out there that knows my salvation on this? I took it to the dealer after installing the cheap aftermarket sensors and upon getting it back it was WORSE // as usual they simply wanted to sell me a new throttle body @ $500 and didnt even try resetting the ECM. I have searched YouTube and find no related '99 Sierra 5.3 videos or relearns for this truck. I have always been impressed with how well this truck would idle upon start up no matter how cold it was. now? its racing at start up.. Thanks in advance!

Curious to know if anyone has worked through this: sticking throttle butterfly (perhaps butterfly?) got to where is was causing jump starts. I tried a thorough R&R and cleaning of the t body / inspecting to see if a rub or catch point was detected at the closed position. This did not help and it was at this point my web journey turned up that many were just spending the $400 on a new t body and .. that dealer had fix bulletin (that I couldn't find this morning) that included using a TB sensor and aligning it digitally. I did buy and install both sensors on the TB and thought I had it licked but even though I did get the stick to got away with a tiny adjustment to the idle screw (closed [sticking] position) I now have the start of a fluctuating throttle after it initially worked fine. I initially thought the t body sensor may have been the culprit but instead appears to be worked around in the computer reseting the new sensor. 1. Does anyone remember seeing this dealer bulletin? 2. Is there a DIY application that has proven effective anyone can point me to? I have way too much into this truck to give up on it now. I was in the Eastern Sierra this last week-end and this was the first time this truck actually ever stalled outright. +_+_+_+_ Oh. and one more question? I had my rear end completely rebuilt and when I picked it up the mech that did the work was not there but the other mechanic said he was told to tell me that he had to put a thickening agent into the diff to quiet it down. Id never heard of this and it sound to me like anything like that would restrict lubing the axel bearings. Anyone? EasternSierraCQ