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BTW, one shop quoted $450 to "fix the problem but it is not the TCC" and the dealer said "no issues found" and the third shop at least pointed to the tranny but "$1300 would replace the valve body and do an upgrade recommended in a factory notice".....we fixed for $60 and about three hours but...

Ok folks....I am looking for a new transmission shop and new dealer....after months of dealing with this problem decided to crack the tranny...keep in mind we have over the past year had to deal with this thing running crappy. Well replaced the TCC solenoid for $8 and a transmission service so...

Well, sorry about the delays in updates on this one but it was not good so had to abandon the truck for a while...been drive the old Chevy truck which is great...simple TBI system and runs great. Anyway back to the update on the 2000 Yukon. Tranny shop did a diagnostics on it and reported it...

Ok, here is an update...as I posted orginally I did not have any codes on this thing for all the issues I am fighting so it became a symptom based troubleshooting replacing the parts. This weekend took and disconnected the transmission main wiring harness...still an issue. Plugged it back in...

Just curious if you got any news on your visit back to the dealer? Still have not done the O2s but let me tell ya I have been a GM guy for a very long time and never had one like this...about to tell the dealer I am buying a Ford.

Sorry about three replies...I have not had any misdirected codes at all on this thing.

BTW, it appears I did not run it long enough with the O2s off...that might be the case as it appears they will be declared, log a code, bad after a period of time, not sure how long or after so many tests by the computer. We only ran it down the street and back...then plugged them back in.

Yeah I have replaced the TPS already thinkingng the same thing. No joy. I agree that it seems to be fuel air mixture but something is telling wrong mixture or something. I went down this path with it and did a MAP, MAF, TPS, idle air control, even a new intake manifold and gaskets, new EGR...

Man you do not know how bad this thing is reconfigure me nuts....changed all O2s and still same issue. I went so far as to put the transmission into manual mode by pulling power and same thing. But your right seems to be related to torque converter lock and light acceleration. Get in it and...

On the MAF input...that is interesting. I did replace it with an aftermarket one...however we elimenated that by pulling one from another well running truck and same issues...also put the MAF we bought into that truck and no issues. Regarding the O2 sensors...decided to try something...

The transmission was rebuilt about two years ago and no issues for that long and then the only thing that was done was the intake manifold gaskets becuase a water leak was found in the tubes under the manifold. That is all that was done but again as mentioned up above that has been gone back...

For both the tranmission question and the testing question related to me doing it myself...It has been both to the tranmission shop that rebuilt the transmission about 2 years ago and the dealer for full diagnotics of which neither report anything but the MAF sensor was reporting low out of...

I did forget those items...sorry. The ECM was just reflashed and the dealer also ran a full diagnostics and did not get any codes or even out of range reports. The entire intake and the throttle body was completely cleaned and even a new idle air control was put on it. The only thing I have...

Ok, this truck has been completely stumped on this 2000 Yukon 4x4 with 5.3 V8....anyone have any ideas...first let me say there are no codes in the computer...ran both engine and transmission codes, nothing. Replaced, MAP, MAF, TPS, EGR, and did plugs and wires. Recently the intake was rebuilt...