Injector Question 87 S10 Blazer 2.8
 

I have a Throttle Base Injector system with 2 injectors. I presume each injector handles 3 cylinders. I have herd a dirty injector can cause a miss and rough idol. How is this happening, bye not enough gas distributed to the 3 cylinders and 1 didn't get enough gas and missed in that cylinder? This is my last draw with this problem I changed everything including injectors and can't get rid of my miss and semi rough idol. Thinking bad new injector. I only have 61,000 on the thing and 2nd owner I can't see it being a internal problem. Help

I would imagine it could be any one of the of the following bad injectors, bad spark plugs, timing off, clogged fuel filter, bad fuel pump.