Any ideas?
 

So for about a year or so when i would take the XJS out, whenever i step on the gas or really kinda step on it, i smell exhaust or something similar to it, like a burnt fuel smell or unburnt idk. and i cant figure what in the world it is iv checked for holes and tightened things no idea.
any thoughts?

be happy yours runs. lol

when i step on it in my grand prix, and really step on it, it shoots fireballs out the exhaust pipes. be glad your XJS doesnt do that.

You might have a bad or dirty injector that's dumping fuel. I'm assuming this is a V12?

HAHAHAH yeah she runs great!!
all the injectors are running fine. im baffled