hey i have a 2000 z28 and its making a funny noise when im in drive stopped at a stop light but its only doing it once in awhile. i had the one cat converter replaced, think it could be the other one or something else?

 

Heat shield?

 

it's been eating gas more then it use too.

 

When was the last full tune up?

 

if its using up more gas there is a good chance it can be the other cat

 

Changed your air filter lately? Also run a few tanks of fuel system cleaner...

 

it could use a tune up. i'm changing my air filter monday and fuel filter this weekend. it sounds like it wants to back fire up through yet.