starter clicks once then loses all power.
So heres my problem. I have only just started working on cars. so im not very car savvy. I started working on my dad's 78 firebird. it has a 402 in it and has been sittin for the last 8 years. i took the starter out and replaced all the spark plugs and when i put the starter back in after having it tested it makes a sound for about half a second then the car loses all power for a while. any help is greatly appreciated.