It prompts a check engine light, and when I gas it in any gear, She surges... like she's holding back and then letting go, holding back, then letting go... I'm also only getting 10-11 psi... I recently put ported and polished heads on it w/ a 10% OD pulley. (I've got to have a vaccuum leak somewhere, or IC tubing seal failure.) But the surging has me baffled and I haven't checked the code yet. Thanks guys...