I stomped onto the gas one day and its never been the same.. i have replaced plugs ,wires,cap,button,air filter,fuel filter, vac lines,iac,tps, map sensor,checked fuel pressure.. it starts and idles fine but runs like a 4 cl. No power,sluggish, five it gas and noses over.. let up a little and picks up speed. Sometimes it struggles to hit 55mph. Cat seems fine no smells, exaust isnt overly hot, flows fine. Im at a loss. This thing has killed my pocket and i have no idea what to try next.. it kinda feels like your in a small boat with small engine how your going 3 mph and when you give it gas it goes then slows goes then slows goes then slows while holding the gas steady.

 

Anyone?? Its my wifes car and we got 3 kids so any help would be great??

 

If you rap on the catalyst with a mallet or your hand and it makes a rattle sound, then it is clogged up and needs replacing along with possibly the muffler.