Joe350

So basically I got this K5 Blazer with 350 in it it's at TBI and when I first got it I think it hadn't been taken care of to Well and I knew was running wasn't running right so I put plugs in it put a new cap and rotor changed wires and then I retimed it to 0 degrees and after I read timed it it started running a lot worse it seems like half throttle to a quarter throttle it runs lousy but once you put it to the floor is revs up and goes good and it's not idling great either. I have checked time to ensure that it is 0 with the sensor unplugged. This is a beater that I got for free so just looking for cheap fixes.