I have a 1967 buick riviera (430 engine) In the morning it starts and after I drive it and turn it off and wait about 20 minutes it won't start. I'll wait another 30 minutes and it starts. It does this all the time! I had a mechanic check the alternater and he said it was good but the battery was bad. I went to autozone and bought a battery and it still didn't start. I wated 20 minutes and it started. the only thing I can think of is the starter or the ignition but im not sure, any suggestions would really help.
thanks
thanks