Hello Club

I got my 1989 Gxl 1.3 running after a year of setting got the speedo meter fixed
but the car has no power will only rev to 4ooo then nothing acts like fuel
I have never cleaned the fuel injectors its got 138000 miles it also has a mis
at idel some times but goes away as i increase the rpms ??
Its not smoking or using alot of oil ??
I have done spark plugs , cables , checked timing

I may need a rebuild the engine what is the life of the engine

Dan H.