Bad ECU 1.6 8v 1990.

[fixkick]

to test and ecu,
we bench it
look for damage
look for acid(boric) leaks. on caps
look for hacking or poorly done repair, (like yours has)
look for caps inserted backwards, (more hacks)
power it up, see CEL glow.
then see 5v on the 5v pin, if not the ecu is toasted.
then we ground diag, if it dont flash out a stream of many DTC errors. the ECU is toast.
and more lots more tests. (I can do about 1/2) the machine to do them all is $100,000 (i used to program them, in a last life) me retired