gasoline coming out muffler

[skoundrel]

I got an Infiniti i30 1998
I've recently changed my knock sensor Wich is undedr my intake manifold I had to remove well once I've done that my car was working for a couple day then all of a sudden the intake manifold started shaking my car
and gasoline smoke coming out my muffler and gasoline also dripping down from it I really don't know what can cause this to happen can some help me out?

[maxhopper]

Welcome to NICO.

It's possibly an injector not seated in the large o-ring properly.

[ImStricken]

I got an Infiniti i30 1998
I've recently changed my knock sensor Wich is undedr my intake manifold I had to remove well once I've done that my car was working for a couple day then all of a sudden the intake manifold started shaking my car
and gasoline smoke coming out my muffler and gasoline also dripping down from it I really don't know what can cause this to happen can some help me out?

dude- that "smoke" is moisture, and that liquid coming out of your exhaust pipe is built up condensation aka water LOL