I have a 93 ford ranger.. I pickex this truck up about 6 months ago.. when I first got it I changed the oil spark plugs air filter and timing belt. It ran awsome for the first 3 months the all of a sudden it died on me.. so then ireplaced the fuel filter fuel pump and radiator, I changed the radiator cuz of rust. The truck ran ok for a coup, e more weeks after that but then it started to hesitate and backfire through the intake. I ran a comp on it and it through theses codes.. o2 temp sensor idle air control valve and maf sensor.. I replaced all of those brand new. The weird thing is thoughin the last 3 months it would run fine for a week then be down for two.. it did this off and on for the last 3 months. I just put the iacv in today since all those sensors are really expensive so I did it a lil at a time. Now that i just replaces I iacv it still backfires through the intake.. the truck wont even idle right and takes forever for it to even start and when it dose I have to pump the throttle to get it to berley idle. At this point I have no idea what it could be or what could cause this. I cant even run a test on it cuz it wont stay ildeling l8ng enough to throw any codes. So what my question is where do I go from here, what kind of things could cause it to backfire from the intake? I am really confident that the timing is set right since I did that over 6 months ago and it ran perfect for about 3 months befor it showed and hesitation and just died on me. And what really has me confused is why would it just decide to run good for a week or two and decide to just quit on me when it wants to.. any kind of feed back would be greatly appriciated! If their is anything else you would need to know just ask and ill try to answer it to the best of my knowlage. Im a pretty decent mechanic not the best but I know my way around and engine.