All of a sudden yesterday mid drive my vtec beacme very loud and weak that engauges 500 rpm later. My car opens up at 4400 and 5600, and the 4400 one wont open. The car is a gsr head on a b20 block. It just got a new headgasket, plugs, and valve cover gasket, and a vss from a Y8 EJ6. My oil and fuel pressure are good, with no CEL's and im going to get the timing checked soon, because it could be a possibilty that my timing got thrown when my mechanic was doing my headgasket. Thanks