new here and looking for help. 2000 bonneville se will stall when coming to stop sign or letting off for a sharp corner. recently had it sitting in yard and rev it slightly and let off engine would rev up and down several times then stall. the part that baffles me is that it does this more often the fuller the fuel tank is. with tank close to empty it does not stall at all -full it will stall 10 times in 15 miles. codes came up po141-po300-po440-po452 i think the po300 is from the stalling as it runs fine otherwise. the 440 & 452 are evap but have no clue where to find them[ used to be a canister but have nothing that looks like old school] have tapped on the maf sensor when running but no change in the running. help will be appreciated more than you know

Sounds like a vacuum leak. It'* a pain but you will need to check all the EVAP lines for a leak.

ready to try anything- can you tell me where the purge solenoid is located- says signal low so hopefully leak is in this area

I don't have a picture, but it'* near your coils on the top of the engine near the front valve cover.

DCook...did you find this thread by chance?

thanks will work at it tomorrow when daughter brings home. will report on progress

Excellent!!! Hopefully this is what it is, but there are a few more things that can be looked at after this is ruled out.

to kevin aka purple checked the thread and either i have a twin or we have the same car

worked at chasing down vacumn leak sprying carb cleaner on lines and componets of anything with vacumn but no change in rpm or running. cleared codes and drove to town ran good came home and checked codes a 452 had reset itself evap emission control pressure sensor low input is this from a bad purge solenoid? couldthe stalling come from a bad map or maf sensor without setting a code? baffles me that stalling occurs more often the fuller the fuel tank. a map sensor makes some sense as it senses the manifold pressure when dropping to idle. any other suggestions will help

I still think you have a leak in the HVAC lines. I believe there'* on that goes all the way back to the fuel tank.