hard to start??
lately for the past few weeks its been pretty hard to start my car, its a 96 with a 180*tstat. when i crank it it just cranks but doesnt start, and i have to give it gas to get the engine running. once it gets running the rpms will go up to about 3000 on their own and then settle back down to around 950 or 1000. ive replaced the air filter, fuel filter, new plugs, wires, new oil change and filter, it didnt pass smog due to high nox. i got some stuff from kragen that goes in the gas tank thats guaranteed to get the car to pass smog, i guess it cleans the injectors and such, but im still having the hard starting problem. i figured that would have fixed the problem, but im going to take it in for a second smog and we'll see if it did any good. also i dont even know what these things are but they look like vacuum lines, but they are just metal pipes that go into the throttle body. there are 2 different vacuum lines coming out of it, and sometimes when i try to start the car one or both of them will pop off the throttle body. i have put new rubber connectors on them, and they still pop off occasionally. does anyone have any idea what these metal pipe vacuum lines do?? im thinking the hard starting has something to do with them maybe being clogged or something? but ive taken the vacuum lines off and they are not clogged, i am just thinking maybe whatever they are connected to might be clogged. ive looked at the charcoal canister which one of the lines goes to, and there is no smell of fuel or anything coming from the pipe or the canister. i dont really know what else could be going on.. but if anyone could help that would be great. ive run an odb2 scanner and i didnt have any codes. thanks