I have a 2003 Blazer 4wd 2 door with 4.3L. Over the las 2 years I experienced sputtering and stalling issues. After stall out it would just crank with no fire. Had to let it sit for a long time then it would fire right up. It used to be only when it was hot out and then when fuel was below 1/4 tank. It just recently left me on side of road. I went thru and gave it a complete tune up. New coil, distributor assembly, wires, plugs, IAC, MAP, Purge Valve, PCV, IAC and ECT. Ran better but would stall after 3 mins idling. Got evap codes P0443, P0449. Replaced fuel pump also after hearing it bog down right before stall out. Truck runs great now. But now does not want to stop. When I come to stop it looses idle and stalls. Starts right up. Only codes are EVAP P0443 and P0449. Any Ideas for Idle issues and stalling?

 

Do you have a vacuum leak somewhere? Also check the hard 3/4" tube that goes from the back/top of the air intake to the passenger side cylindar head. If that got left disconnected it can cause the truck to bog down and maybe stall when stopping.

 

I will check the vacum leak. Thanks.