i poured it in with the engine running.. slow drips until the engine started to sputter then i would back it off until the engine recovers.. and repeat until 1/2 can is in... where did you put the seafoam? i know that if you put too much into the intake hose, your car wont want to start because tehres too much liquid in the intake

i would get the engine started and let it rev around 2k rpms or so for awhile to help burn the seafoam down to a level that your engine can manage it