VS 5.0L statesman not changing gear properly

[darky82]

Hi new to justcommodores, After any advice, Just changed my inlet manifold due to a water leak, aslo changed my thermostat from a 195deg F to a 180deg F because it was slightly getting hot with the weather we been having while using the A/C, all went well till i went for a drive, now when i cruise the auto box hesitates when changing, but if i flatten it it changes ok, but not kicking back, the temp stays a needle width above a 1/4 just wondering if its to cold and the computer still in cold enrichment mode try to warm the engine, had a stage 4 memcal in, i removed and reset the ECU and still the same.. help im DOOMED!!!

[Brett_jjj]

Try checking for any set error codes.
Checking error codes VR/VS (Revised)

[BlackVXGTS]

Make sure you haven't damaged the wiring connection to the TPS (Throttle Position Sensor) which is mounted on the throttle body.