My 91 suburban had no spark wouldn't start replaced ignition coil and fired right up drove around all day no problems. Sat over night and same problem no start replaced coil started right up did same thing next day? Any ideas what's causing this?

 

try changing the ignition control module in the distributor, common cause for intermittent no starts

 

I did but put cheap replacement in going to get access Delco and try that thanks