well all i did was change the brake pads... bled the brakes as well because of crazy hard pedle

now it idles up and down... sometimes i can turn the heat on all the way and it keeps it high idle or turn it off to avoid this b/s... but its always kinda idled high or really low but now its up and down...

any idea where to start?? i havent changed and fucked with any other ---- ... its just a stupid 90 civic dd piece of ***

EDIT- So ---- that i was driving and the check engine light came on... so i read the code - CODE 1 easy enough i just unplugged the ----- and its fine.

id replace the o2 but its a ------- tight fit for a 10$ part..

 

Check to see if the check valve going to the brake booster is fucked up..if you pull it off, you should only be able to blow through it in one direction...this would make your pedal hard because the booster wouldn't be storeing any vacuum. It could also affect your idle becuase it would make the brake booster pull way more vacuum than usual. It kinda acts like a vacuum leak...You could get the code from a car trying to rich up to mixture and getting confused...