190e stalling on steep slope (forward only)

[merc380sel]

This is my 3rd post here regarding this problem.
Replaced ICV,OVP and Fuel Pump Relay and also checked speed sensor and all wirings as suggested by Steve and Jackd.
My 190e still stalls when slowing down on a forward slope.
I let the car glide down the slope on Neutrel to see if it was the tranny that is causing this problem, but the engine still cuts off when the car is gliding down a steep slope when the brake is applied.
It is like something is going wrong in the car or not working properly when the car is tilt forward when applying the brake - on rush pressure problem ??? battery???.
Will fuel pump and filter contribute to this problem?
Please help as mechanics here ain't that familiar with W201 engines.