ok i just got an 83 280zx turbo it sat up for a year befor i bought it. on my way home from buying it it ran good then all of a sudden the tach stated jumping and it started sputtering and the sensor light came on then it died i thought i was out of gas so i put gas in it and cranked it up and finished driving it home. the next morning i cranked it up let it warm up and now it wont rev above 3000 rpms. as i slowly push the gas it revs up and it hits 3000 (not floored) and the more gas i give it the more it boggs down. now if i clamp off the fuel return line i can rev it up to 5000 rpms before it boggs down someone help i put new plugs,wires, fuel pressure regulator, fuel filter, and ignition coil still no good Someone please HELP!!!!!!!!!!!!!!!!