need some help here
 

Ok so here's the story just bought a 98 grand cherokee Laredo 4.0 2wd ($800) (one bad wheel bearing)which is a great deal test drove fine everything worked fine drove it home (50 mi.) Stopped by a gas station near my house when i left it didn't want to shift so i pulled over shut it off for 2min maybe. It's started up drove the remaining (5mi) home no problems the next day i drive my brother around the block and it dies. It would turn over but not crank so after doing some research i change the cps. Then it cranked up just fine i drove it around the block again and was not shifting again i park to look around online. Now it just cranking but not firing up again. Also all over head lights are staying on