I have a 90 honda accord ex that just recently had some issues. It idles like a tank and the idle goes up and down and when put in gear it stalls out immediately.
Or when it does get going down the road it stalls out when you press the brake. I have changed the fuel pump and filter and the plugs and plug wires. I also put in fuel injection cleaner as well. What have I missed that may solve this problem?

 

sounds to me like you have a vacuum leak. check all your vacuum hoses and connections. ensure there are no cracks in the hoses and there are no open vacuum ports on your intake manifold.