hey guys, as the title says. my truck has a hesitation and it stall out sometimes. i can ease into the throttle like a granny and make it run perfect., or if i hammer on it. but if i go to drive it normally, the rpms will go to about 1700 then it will want to stall. this happend along time ago and i did the tps and map and i thought i got it. but nowmonths later its back. it started after i took the valve cover off and replaced the passenger side gasket. i think mabye 02? sensor. im lost any suggestions would be awsome. i put new plugs in about a month ago. and the wires are newer too. thanks to anyone who has ideas.