My 97 taurus takes a long time to start sometimes not until engine cools down after driven. obd2 codes 443 174 171 keep showing up then engine light comes on then sputters and stalls can anyone tell me what to fix i already did plugs wires and coil also changed starter 5 times?

po171 and po174 codes mean system lean bank one and two. Ford Taurus's have issues with intake gaskets leaking when its cold then as the car warms up they swell up and seal causing the car to run better. Also they have an issue with the elbow that connects the pcv valve to the intake getting weak and collapsing the finally busting causing a bad vacuum leak. I would check these two issues first. You can test the intake leak with a can of carb or throttle body cleaner. Start the car and while its running bad spray the cleaner around the where the intake bolts to the engine and other vacuum if the problem is found you will notice a change in how the engine runs or it may stall if it goes back running bad hit that area again with the cleaner if it changes the engine there is your problem. po171 and po174 codes mean system lean bank one and two. Ford Taurus's have issues with intake gaskets leaking when its cold then as the car warms up they swell up and seal causing the car to run better. Also they have an issue with the elbow that connects the pcv valve to the intake getting weak and collapsing the finally busting causing a bad vacuum leak. I would check these two issues first. You can test the intake leak with a can of carb or throttle body cleaner. Start the car and while its running bad spray the cleaner around the where the intake bolts to the engine and other vacuum if the problem is found you will notice a change in how the engine runs or it may stall if it goes back running bad hit that area again with the cleaner if it changes the engine there is your problem.