after 5 minuets i was trying to excelarate when the speed limit turned to 55. no more power so i pulled over checked under the hood.there was some smoke may bee axcel  geese from blown boot. but was ode was that the muffler pipe was red hot after the cat converter. its anew cat new coil new wires and plugs new knock sensor, its not overheating. idles fine. now i'm stumped.

Okay, please try to slow down and spell your words better, its really hard to read your post with that grammer.

 

So from what I gather your car started loosing power and you stopped and popped the hood to see a red hot cattilic converter that you recently replaced?

 

Do you have any oil consumption? And when you replaced the front cat did you do the rear as well? Check for blockages in the tail pipe, because something is causing your exaust to back up could be bad rear cat.

Cats toast.

 

It's running too rich and too much unburned fuel is going down the exhaust.

 

Need to figure out why its running rich and fix that first, or it'll ruin another cat.

vacuum gauge testing will help confirm exhaust blockage.

 

any CEL codes?

 

as said above A:F ratio is off - kinda wonder if car could also have slipped timing but, exhaust blockage could explain everything. - maybe what killed the original cat has killed the new one?

Edited February 10, 201610 yr by 1 Lucky Texan

thanks for the help. i will check A.F. ratio and the timing belt also for exhaust blockage.