Cj_ls1

I'm lost my aunt has a 94 formula which of course is an lt1. Put a lot of money in the car fuel pump spark plugs everything has pretty much been changed. Of late the car will crank but won't start which is wierd if we take the battery out of the car for a couple days an you put it it back it will start we took it to a shop they couldn't find anything wat could this be I tried to start today drove to the store came out wont start