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run the fault codes as the hesitation could be acceleration position sensor of maf/vaf sensor related
as for the transmission it could be a solenoid or pressure sensor and that will also be in the fault codes
If you have not changed the transmission oil in the last 60.000 miles , it would be a good time to do it as the problem may be from dirty oil
Check for Codes & look at all data Have the spark plugs been changed every 3 years since the truck was new Have all the ignition coils failed or been replaced since 2003. And on & on Can't be all that hard to get figured out
The reason for hesitation of vehicle when accelerating is
due to lack of transmission fluid. Check your ride for any leaks and repair
them. Filling the transmission tank with fresh fluid after repairing may solve
transmission issue or possible even transfer case? i had low transfer case fluid and that happened and there was metal screeching sound. my car hesitated then grinded down to stop. had to put more oil in the T-case. but then yours might just be transmission issues possibly?
code po742 torque converter clutch circuit stuck on conditions. code p1811 maximum adaptive and long term shift conditions.see this code transmission fluid is low and contaminated.change transmission fluid and filter see if this help your problem.you need to fix this problem fast transmission is not getting enough fluid to work.
There are diagnostic tools that could help detect what your problem is. The Snap-On Modis, or preferably a "Tech-2" GM scanner. Any reputable transmission shop, or GM dealer should have at least one of the two. It sounds to me like it could be the transmissions "EPC" (Electronic Pressure Control solenoid) The EPC controls main line pressure, in an effort to keep shift firmness, and shift duration at one specific level. This is to compinsate for the natural wear a transmission encounters, and to keep emissions as low as possable, by keeping shift duration low. When the EPC malfunctions (and thats somthing that they like to do in the 4t65E), it typically starts to shift harder than normal. They typically throw a P1811 code. (P1811 is a "max adapt-long shift" code) And the malfunction can be intermittent. Hope this helps, and good luck. Logan