Loud exhaust explosions, too much carbonization and fuel after the throttle valve
While disassembling the throttle body, I noticed that had too much carbonization and fuel (actually leaked as can be seen on photo) right after the throttle valve (I had cleaned about 1 year ago)... Is this normal? Another problem that I have is the exhaust (it's seems to be) explode(really loud pops) some times when I accelerate and leave the car go by the inercia...
Why is there fuel there? Bad valve timing? And is this causing the exhaust pops?