My car keeps stalling when it comes to a stop and even stalls if you leave it idling.

I rechecked the fuel pressure today and I am not getting more than 4 Bar. I must be doing something wrong with the CIS gauge tool.
Two days ago when I was testing just the lower chamber I had 5.2 Bar. Then yesterday it dropped to 3.5 Bar.
Today I hooked up the A/B with valve hook up to measure the upper and lower chamber's pressures but as noted the pressure was no higher than 4 Bar. In addition, it didn't matter if I had the valve open or closed on the CIS tool the pressure remained the same thus showing no differential. I know that I must be using the tool totally wrong considering that I am at an angry stage right now (It has been a whole year of hell trying to figure out what's stalling this car and I am tiered of dumping parts on it and I sure don't want to take it to a mechanic so I can get the usual lies session).
Right now I am breaking for lunch but I will this afternoon run some more tests and actually this time print the damned CD out.