Does it smell like rotten eggs? Burnt toast? Sweet smell? It's hard to diagnosis a smell over the internet, but I would inspect for any coolant or oil leaks first.

I figured it out it wan the overflow on the coolent res the line was missing so when i refilled the radiator and drove it around it was dripping on the manifold it smelled sooooooo bad that and i also have a tiny leak on the rear main seal and i have to replace the valve covers their cracked and leaking on the manifold also !lol