Car is running like poop!

[DRFT]

For over a past few months my car has been eating up gas like theres no tomorrow. my check engine light comes on and says its my injectors and o2. so i change the o2, injectors with all new seals and along with the change is new plugs and wires. Still no go.

heres a little past info about the car also. Before all this happened, i did a 5 spd swap. and like a idiot, i lost some of the exhaust manifold bolts, but most of them are still holding it in place. now my car has a bouncy idle and i can smell carbon inside the cabin. DO you guys think that if i have a semi loose manifold, that it will give the o2 a bad reading and send the ecu a bad signal?

what else can i do to fix this problem?

[Al_S14]

an exhasut leak between o2 sensors will cause O2 code to come up as well as leanfuel mixture= injectors.

[EchoOfSilence]

so yeah, go to a hardware store with one of the bolts from your manifold, have them match them, then put them on. should be fine after that. about the injectors... i dunno