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So i have a couple problems ive been having with my neon. it and at with 2.0L i4 w/ 91000 miles.

first, it is very rough at starting up. sometimes it starts up fine after it was shut off not to long again. but if it has problems, it takes a couple extra seconds to start up or it is turning over then it dies and then starts up the next time. my friend thinks it could be the injector box. wat do u guys think it could be? and if u think it is the injector box, where would i get that?

Second, sometimes, not very often but every once in a while the front end of my car shakes up and down when taking off from a dead stop. it seems to be fine if i let if roll forward a little then accerate from there or if i accelerate very slowly i dont have any problems. it also does it minorly sometimes when it is shifting from 1st to 2nd gear or 2nd to 3rd gear. my dad thinks it could be watever the thing that connects the drivetrain to the wheel that can go up and down when going over bumps, i have no idea wat thats called. hopefully i explained it well enough for someone to understand.

any help would be greatly apprieciated. thanks, ask me anything u dont understand.