i have a 1998 cobra , heres the deal i start it the oil pressure is fine but when i start to drive and go through the gears it drops everytime i let off the gas i mean it hits the red mark and i can come to a complete stop ond it jumps from red to way up to the high end of normal ..what could this be ..why is it doin that???? i cant figure anything out the oil is fresh the car has 53k on it ...help please lol...im lost on this one