Ive tried my best searching the site for my answer and no luck so far so here goes nothing, I have a 1999 3.2 Tl with just over 190k(I know its a lot but trust me the engine and tranny on this baby work like new) The car now has a new starter, battery and terminals, ps pump, front left and right axles, tusdo axle back, TEIN STech Lowering springs, and aem cai. As I stated beofre the car runs like a champ until today.... a mile away from home I noticed my car rumbles like crazy at any speed only when giving it any amount of gas. I have noticed a slight loss of power between 2000-4500rpm and my car gives off a rotten egg like smell from the back and yes my CEL is on. If anyone has any info on what may be the issue here please do share. Ill be getting the code read a bit later tonight but and info before hand would be nice. Thanks! Alex.

 

Honestly, it could be anything at this point. My suggestion is to get the codes read and go from there.

 

will probably pull a P0420.your cat may be clogged/shot. Do you do a lot of short trips? I would try going for a nice long drive to heat it up. Immediately after check under the car and see if the catalytic converter looks red hot, as it may be clogged. acuras are picky about aftermarket cats so I would try several small things before I bought a new cat