i have a 98 civic dx auto and it has check engine light so i decided to run the codes. i was wondering if u guys would help me out. it picked up 5 codes
1) p420-catalyst efficiency below threshold (bank 1)
2) p0301-cylinder 1 misfire
3) p0302-cylinder 2 misfire
4) p0300-random/multiple cylinder misfire
5) p1456- manufacturer control auxiliry emission control
well when i turn on the car for the first 10 sec. or so it acts like it wants to turn off like its choking or something but then after it reaches a higher rpm it goes back to normal, it also been wasting alot of gas recently but other than that it runs fine. hope u guys could help thanks

 

Sounds like you need a tune up. I would go for new plugs and wires right off the bat. If that doesnt help, new distributor cap and rotor. It may be dumping gas into the catalytic since you are misfiring, thus the cat code. My cat, is totally shot, the code returns no matter what. I'll be replacing it this spring/summer. Hope you are more lucky.