hey there my 99 disco I is acting up my check engine light was always on because i had a bad o2 sensor but it ran decentonly shook a little now my check engine light is flashing i have a very big decrease in power and it is definitly misfiring also my plenum has what looks like a hose fitting on the left hand side right in the middle and it feels like it should be hooked up to something but i dont see where anyways any help would be appreciated i am slightly mechanically competent im in school to be a diesel mechanic and i just got this car from my mom it was sitting around for about a year and a half but ive been driving it last two weeks and it was running alot better
thanks fior your time

 

99 is new enough to be OBD2 (by a long shot :-); if it's drivable enough to take to the local Autozone, they'll plug in and read your code, and tell you what you have wrong.

If you think you have a hose popped off, I'll bet you do, and it's vacuum..

 

Get the check engine codes read for free at an autozone and bring those 4 digit codes back to us and then we can diagnose.

 

i took it to a place and wrote down all the codes it was alot i lost the paper but i can go again soon alot of them were about random multiple cylinder misfires and that my o2 sensor was bad and than codes for individual cylinder misfires on 1 3 4 6 and 7 or something like that agian i can go redo the code scan soon im planning on changing o2 sensor and plug wires and changing all the oil and fluid i e brake and trainsmission fluid and changing all the oil in the engine transfer case and differentials i would also like to change fuel filter, can any one tell me where to find it ? from what ive looked up on the internet its a canister type with the fuel line running through it so i will go get those codes too any one got any suggestions for any other maintainence my mom never took care of? also i just rolled it over 140k so it has alot of miles on it thanks for any help also would a vaccum line being missing contibute to my misfires and really weird idle?