Clogged cat ?

I wish you would have let me listen to that thing while i was there....The Z did that but not terribly. Does it crank alot when warm yet start up instantly when it's cold? Leaky injector(s) def might be flooding a cylinder or two. Maybe some top engine cleaner couldn't hurt either. It ran great on the way up, and correct me if i am wrong, but it sat for quite sometime, right? Something could just be plugged; gummed up. I would shoot for a map or tps, but you say no codes....

:shock: