problems with 91 non turbo rx7
 

normally my car will start up just fine but some days it will just turn over but never start, and then when i bump start it it runs fine the rest of the time i drive it and even after i turn it off later in the day it starts right up is there any normal cause for that ?

also when t doesnt start i normally get some white smoke out of the back end

Eek..... Check your compression?

You may have a leaking fuel injector that is flooding the engine when the car sits for awhile. Next time you try to start the car and it just turns over, remove the leading spark plugs and take a look. If they are wet with fuel-oil, it may be a leaking injector. Pull the injectors and have them cleaned and tested by a professional. Cruzinperformance.com is one such place you can send them for service.