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Chevy Colorado 2.8L I4 LK5 Swap

183K views 849 replies 56 participants last post by  wrench459 (R.I.P.)  
When the GM compressor was used the spring was in the kit unless parts department kept it. The ARA kit with the York compressor did not have a spring (alum. compressor).
HTH
John
 
If you have the factory PCM, the transmission shift point are controlled by a MAP system to learn car demands and it will set a program that gives the best performance and fuel eco. and emissions. Example : when the transmission has to be rebuilt and after it is reinstalled you reset the transmission shift adapts to the center of the MAP program until it relearns the shift modes or you will have hard or skipped shifts.
So if you have a PCM that has been re-flashed the program may not be correct or all parts written.
The sputter between shifts sounds like the fuel injector shut-off for the RPM exceeded limits to protect the engine and drivetrain this is written into the GM PCMs.
It look like you need to control your transmission either a trans control unit or have your PCM re-flashed for transmission control.
Someone with a Tech-2 could scan and control your transmission to see what is going on.
I tried to keep this simple to keep it on track with out to much detail.
HTH
John