04 GT bucking and exhaust smell

[Himself68]

hey guys I'm new around here so I'll just get right to it. I have an 04 GT with just a K&N intake right now, I bought it when I lived in Miami with 26k on it... i now live in pennsylvania and it has just under 34k on it... i started having some problems a few months ago after jiffy lube did my oil and fuel system cleaning... my car started bucking and the rpms reving by themselves... it does it in reverse and drive when im stopped... whenever i am moving its gone, but starting it sometimes will stall... however once i get the engine warmed up, it will go away... also i have a rotten eggs smell coming out of my exhaust... my check engine light has gone on off and now back on again...
HELP ME PLEASE!

 

[03 Mustang gT]

the smell of rotten eggs is usually the sign of a bad catalytic converter so that would attribute to the check engine light and could prob be affecting the bucking an rpm stuff as well. good luck

 

[Himself68]

is there a way to check my cat myself or do i have to take it in to see... also arent the cats gov. madated warranty for 7 years or 70k miles?

 

[03 Mustang gT]

not sure but unless you have a code scanner you should take the car in to have the codes checked to see for sure what caused the check engine light

 

[flstang65]

I thought cats were warranted for 85,000 miles no matter what?

 

[squeak93]

Check the codes first. It is possible that you have a clogged fuel filter even if they just put a new one in.

 

[Brute03]

i'm pretty sure u have a misfire, hence the sulfur smell from the cats. get those codes pulled and let us know

 

[Himself68]

well with the problem of being a full time student and worker fueling the american economy lol i havent had time to bring it in... im going to replace the fuel filter myself just becuz i planned on doing it anyway as part of a tune up... if that doesnt fix it we pretty much kno its the cats... ill keep ya'll updated thanx