my 95 blazer has been running terrible. sometimes it starts hard but does start..after running i'll stop at an intersection and the idle will be real fast. if i shut it off and start it again sometimes it will go back to normal idle. and when i'm driving it is very sluggish in low end power like when you stomp on the gas it just doesn't go it bogs out, you let up alittle then stomp it again and hold it down then it like kicks in like powerban on a 2stroke and just flys! driving down the road it will jerk and hesitate and go! have replaced the fuel pump,the injector lines, the injector,fuel pressure regulator. not getting any check engine lights though. wondering if my computer could be bad? maybe the idle control valve? but would that affect when driving down the road. had replaced the EGR valve about 1.5 years ago. any help please ? thanks

 

Welcome.

How about a general tune up? That is always a good place to start.