92 rs 305 tbi has no power under load w/ more than 1/4 throttle, stumbles past 2300 rpm w/ no load. i replaced the fuel pump/filter+ bat/alt on this backyard rescue. it ran well at times when i first got it running, but the problem is now constant .fuel flow and pressure ok no dtc"s. ignition issues? clogged cat? can somebody tell me what to take apart next?

needs new cap, plugs, rotor and wires. then go from there. Good luck

I'd personally look for a clogged cat, I had a very similar problem when I had an IROC-Z. The drop in power just got worse and worse until I changed out the cat. After that she ran like a champ!

did cap/rotor/wires/plugs+throttle position sensor today with no result