I thinkI may be suffering the same but in my case I'm also getting a "hard shift" unless I gun it and this just eases the hard shift - doesn't cure it. I've never cleaned the flaps and I'm currently at 264K miles (owner for the past 180K miles) so i know I'm due.

I do have:
- hard shifting issue
- leaking fuel lines (replacing tomorrow)
- gunked up manifold (getting cleaned tomorrow)
- CEL with an associated EGR code (due to the above I'm told)

Will the cleansing of my manifold rectify my shift issues? i don't see any obvious breaches in my vacuum lines - up front or near the TPS.

Thanks for any other suggestions.

__________________
1991 190E 311K [Brilliant Silver/Black MBTEx] -retired
1996 E300 315K [Black/Grey MBTex]

Want to put a tank in the trunk for WVO/SVO in the E300 Need to find a place to store my OIL!
Still procrastinating about the biodiesel/WVO
Made some biodiesel but so afraid to pour it all in - I've added some and think I'll supplement my fuel to see how I make out

Made some biodiesel but the process scares me - methanol fumes are not your friend! Need to do this outside.