01 MPV drives very slowly
 

Van started to drive very slowly on Saturday. Check engine light came on. We also did not make it home. We stopped at Autozone and 2 codes came up - 1512 and 0300. We got it towed to the mechanic who replace the Intake Manifold Runner Control and replaced spark plugs. the check engine light has gone off but the van still has no power. It is still at the mechanics. Does anyone have any idea as to what the problem could be? It has 112000 miles.

check ignition coils, and chaeck the o2 sensors