replaced lower intake manifold gaskets due to minor coolant leak. when removed intake, coolant spilled on motor and assume into cylinder heads as there was anti freeze on plugs when pulled them out to check why car wouldnt stay running after put back together. cleaned out best could, replaced all plugs/wires but car still will not stay running. if hold at 1/2 throttle, sounds like timing is off and went left off idle, car dies. did not touch the timing. did not have this problem before removing intake manifold. what could i have done?