Having problems with my 88 Sami 1.3l.

When you first start it up it runs fine, idles great, revs up nicely.
Once the engine warms up I have no power. It will idle irractically and stall when given gas.
So far I have replaced the accelerator pump, plugs, wires, cap , rotor, ignition coil, retimed the engine, reset all the valve clearances. Still nothing seems to help. Please let me know any ideas you may have on the problem.   Thanks

Did you figure out your problem? I am having something similar.
Tony

i had the same problem did the same things you did and it was the cat for me. i checked by dropping the exh at the manifold and running it problem didnt persist so i hollowed out the cat.

btw itl be very loud if you test it that way  like nascar loud lol

Mine was dieing and the idle became too low. It was one of the vacuum hoses on the manifold . It was kinked and hence closing off. It was delivering vacuum. I put a piece of welding wire on it to hold it up so it could colapse. I reaaly should go spend the $.10 for a new piece of vacuum hose though. Fixed.