Engine Rebuild Project went wrong need information from the ECM

Hey all,

Just wanted to introduce myself and share my project. My name is Rafael and I live in Venezuela. Currently working on my 92 S10 Chevy Blazer with 4.3L TBI engine and PCM 16144288. In the final of the last year i was able to rebuild my old and poor 262 v6 4.3L engine. It was smoking a lot and had poor engine performance. Now it is better but it have a rough idle and I think a missfire. Searching in the Internet, I found this forum because i am triying to do my homework and search for a solution for my problem. The mechanic say that is a electronic issue but i´m not sure about that so, searching for clue I bought a ALDL scanner from 1320electronics the past month and just this week I could connect and check the data from de ECM. I saw all good so i will search in this forum to grow in my knowledge.

So i am new to this world and i´m searching for answers.

Thanks,
Rafael