190e 2.6 '91 drove in garage last evening all ok. Tried to leave this morning & I let it warm up for a while. I started out in drive noticed it was taking long time to up shift. Well, it never did. So, I tried some things. Starting in 2 on console it will start in lower gear, but never shift. Start in 3 on console it will start there, but never shift up & the same with D. If you start in 2 on console it will never shift up if you manually move the shifter, and as well if you start in D or 3 on console it won't shift down to 2 manually. The only way you can alter it is by shutting of the engine and starting it again & putting it in 2 or 3 or D. Starting out in D like normal you can never feel it shift & it never is in 4th gear. I have checked the vacuum to modulator and it's good. I unplugged the kick down switch, and that didn't help. I checked the fluid is it good and clean and to the full mark when hot. I haven't did anything else at this point. Would appreciate any help on the issue.