My exhaust fell and I fixed it. Problem seemed fixed till I hit a bump and now my exhaust sounds like shit. I have an appointment to have it fixed but like most Americans I need it to go to work till then. This morning I went to back up and I had to slam on the gas to get it enough power to go in reverse. I hope thats all thats wrong with it. My question is why does the exhaust affect your reverse?

Fuel injectors were leaking. Replaced. O-ring split on install (without knowing). Gas filled (gallons) exhaust system. Fuel was leaking everywhere, blasting out tail pipe, blew a bunch of carbon out. Replaced o-rings. Changed spark plugs. Changed oil filter, replaced oil. Still ran rough. Fan was kicking on when it shouldn't (54 degrees out). Thermostat froze, replaced thermostat. Flushed radiator, replaced coolant. Rough start, once running it runs smooth on the freeway, no missing or anything. Starting scares the crap out of me. Check engine light comes on. It's throwing a code saying fuel to rich (or something like that). Planning on replacing the oxygen sensor. Any other ideas?