It Sounds like they slapped it back together somewhat The self tapping 8 or 10 hex head screws for the air guide aren’t common but you can swipe one from the fender mount until you have a big enough order at FcP to get free shipping. ($50) The engine mount bolt is more critical , you can pull a seco...

Parts store shows three different part numbers for the mount bolt. A good place to sort these out is skandix.de They often list dimensions of the bolts in question so you can match up

982797
982819
985163

Have you checked the fuel pressure at the injector rail? When you turn the ignition to Pos II, do you hear the fuel pump priming? If you can find a junkyard fuel pump relay I would consider a swap on that first. Looking at your list of issues it would sound fuel related but it needs to be eliminated...