Thread: Wont upshift 2-3 but down shifts 4-3

I forgot to mention that I replaced the purge solenoid and the light never went off, so I figured I had a vac leak somewhere. I've looked and never came up with anything tho

It is possible that codes are sitting there. To ensure you had codes, I'd drive it..get the issue to happen and the harsh shifts. Then w/o turning it off..have it scanned. Many trans codes reset on ign cycle to help the trans behave it's best in case something stuck or was a one time type thing.