i have a 96 z28 and it has new plugs and wires but yet the service light is still on. Its not blicking like its misfireing but when i shift into 2nd it kinda feels like it lags Until i get up to 2000 rpms then i can feel it catch up. Somone said it might be a crack in my intake manifold. But i have no idea what it could be. When the mechanics scanned it it showed up as a traction control malfunction but they said that wouldnt be cause the lag ? any ideas