1996 Chevy S-10 hesitates stalls

I have the 2.2 engine. When I lightly press the gas from a stop it will almost stall untill I let off then it catches. When I slow down to make a turn and then slowly accelerate it does the same thing. It has a skip at idle and sometimes I get a strong gas oder. It runs like a champ on the highway. Service light was on showing evap codes P1441 and P0172. Gas cap helped with that for now. I have replaced oxygen sensors, plugs, wires, crank sensor and IAC valve. Also checked for vacum leaks. Thanks for you help. I'm getting ready to suck it up and go to the dealer.