my cousin noticed the other day when he was checkin out my car for problems that....when i start my car.. theres a spark right under my intake manifold...this spark only happens for like a split second right when i turn the key to ignition...what could this spark be??..

 

there are various sensors and wiring under your intake manifold... any one of them could have bare wires exposed that touch the metal... or your starter wire is loose... check to see if the starter wire is tight then move on to the wires under the manifold...