Strange starting problem

Noob here. any help would greatly appreciated. k11 1999 non coil pack. new battery and full fuel tank. no signs of a problem before, just wouldnt start in the morning before work. starter kicking over fine but no signs of firing at all. thought it was fuel but i think its getting fuel - pump priming and fuel flowing through filter. car wouldnt bump start. i read on one post about disconnecting one of the injectors. tried this and it fired up on 3 cylinders and reconnected the 4th and it runs fine. if i leave the car for more than 2 days it wont start again- have to disconnect an injector again and it fires up fine. any thoughts? thanks in advance
 
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