olds 307 and 403

As said, your heater core is leaking. The 4 prong plug means you have a lock up converter. You can leave it unhooked for now, helps reduce slippage and rpm on the highway. Good if you go steeper on the gearing later on.

NMcCarthy

what would cause power to come in and out sort of like surging????

oldcutlass

Need a better description, are we talking engine power of electrical?