2002 escape is great on open road, but when at a stop it bucks and stalls.

Hello, Sounds like the idle air control valve is clogged, but there are also several other things to look at. The EGR valve might be sticking open as well, or you could have a light compression issue. What codes are you getting back?

The code I'm getting is PO430. Deficiency on bank 2. Thanks for your reply. Another thing I've noticed is a gas smell coming through my vent sometimes when I start my car up. What is the lowest temperature I can run just straight water through my radiator . I also need the radiator replaced but just can't afford it now trying to find a mechanic that is able to fix it for me for cheap but do it right.