multiple misfires?
 

hey everyone i just erased the codes off of my 2000 discovery II with 122000 miles on the motor and i got a few codes i need some help with. Heres what i got in order

P1300 catalytic damaging misfire
p0303 cylinder 3 misfire
p0305 cylinder 5 misfire

i looked the codes up i just dont know where i would get started trying to fix this problem. Any advice? my catalytic converters are broken by the way, i already know that. My car sound like a diesel engine and it sucks but im trying to fix the problems one by one. any help would be greatly appreciated.

When was it last tuned along with a new set of 8 mm silicone wires?
When are you going to deal with your cats?

last tune up was recent but i've never changed the wire plugs on my truck. I was planning on replacing the cats after the misfires are dealt with because im not driving the truck at the moment. any advice on where to start?

Sure, get rid of your burned out factory grey plug wires, may still need plugs then head to a corner muffler shop and get a couple estimates on replacing the cats with after market units.

thanks for the quick response mike. will after market cats be alright in my truck? i know these trucks tend to be quite picky.

also how bad is it to try the car without the cats?

Yes, you can run after market, $60, cats with no problem except in California.
It will not run well with a busted up exhaust system.

Im in California so that sucks. I was quoted $335 per cat earlier so looks like ill be dumping some more into my car

So I cleared my codes and came back with a p0130 but no misfires. Any thoughts? I already ordered my new set of spark plug wires. Any advice would be greatly appreciated