Morgan12

I should've mentioned I have changed the TPS and cleaned out the IAC valve extensively twice. Also replaced the coolant temp sensor and had the tranny fluid and filter changed. None of the above have fixed or improved. Tried to do diagnostics mode but unsuccessful due to lack of operator knowledge

R33 GTST Auto Issues Hi there, I am new to the skyline family but I am having some issues as of late. My car is a 1993 Auto R33 GTST Skyline 4 DR Sedan. No real major mods. It has been running fine for approx 6 months and now I am having issues with auto box. Upon starting it revs at 1200-1400 rpm for 10 mins then drops down to 500-600 rpm. When it does this, the gears will not change until I hit higher rpm between 3500-4500 rpm. Does this in cold weather more often. Please any advice would be appreciated