Technical HELP! Punto HGT stalling.

[foltzie123]

I have a 2000 Punto HGT 1.8L. I have been driving myself crazy trying to figure out a very sporadic stalling problem. My car will stall out whenever I am approaching an intersection or roundabout and I begin to decelerate and either press in the clutch and hit the brakes to downshift or kick it into neutral.

The stalling is VERY intermittent. Somedays it won't stall at all. Other days it seems like it stalls every time I come to a stop. If I am sitting in the driveway and rev the engine. 8/10 times it returns to a perfect idle. Sometimes it will dip too low and stall out.

Some things I have done so far

-changed engine coolant temp sensor
-changed spark plugs
-disassembled and cleaned the entire throttle body to include the IACV and MAF sensor.
-checked for vacuum leaks.

The car starts great and runs great. I just can't figure out why it is stalling some days and not others.
***I did have the battery changed about a month ago and I believe this is when the problem started. So I'm guessing it might be electrical at this point?

 

[bfbenf]

Do you have any ability to access any stored diagnostic codes or live engine data?

 

[foltzie123]

Not on my own. Is there some sort of device you recommend I could buy online to be able to do it myself? And what kind of info would you be looking at to help troubleshoot it?