so i got my new resonator put in and ever since then my car tends to not wanna start. when it does it idles around 1500-2000 drops down to about 600 sometimes then goes back up. only code going of is P0118. didn't mess with anything electronic except the downstream O2 sesnor. any ideas as to what could be going on??????? kinda need my car running right by end of today thanks for any help and i mean any help

 

ok so my car is posessed. I erased the code, started the car and let i t run for about 45 minutes no problem. except i noticed a hissing sound from around the exhaust. now back under the hood i go. still looking for any info on the high voltage