i don't have a vacuum leak and i give it a tune up alreadly but when i did the ignition coil was bad(it had a lot of black stuff in it)so now do i need to put new spark plug in it agian.i car also give me a code 16 but i change the injector and it stop giving me the code 16 after i reset the ecu but now its doing it agian can the be the problem.i also have a code 1