issue with car after mechanic looked at it

[broski]

i dropped my 91 nissan 300zx off for inspection about 10 days ago.

now when i put my car in, it had 2 bad injectors, i knew about. the car ran fine, was great on the highway, never stalled, no issues. idled a TAD rough, but nothing major at all.

mechanic called me and said i wasnt going to pass emissions and needed to replace the injectors.

he ends up doing that, and also a coil pack.

i get the car back. it passes everything.

but now.

my idle is ROUGH AS HELL. so rough to the point it actually stalled on me when i got it. the car runs worse , WAY worse, then it did before i sent it in.

i got this done at a small shop near me, had good reviews from people so i tried it out.

what the hell do i do? are they liable to fix it? like my car runs like total CRAP right now. i'm high idling and then dipping really low.

also driving feels super choppy and rough.