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Q: got a rough idle and when I try go maintain a steady speed it gets a little miss on 1991 Chevrolet S10 Blazer

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I have replaced most vacuum lines but the line from the carb to the vapor canister when I take it off it does not change anything no difference?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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It has throttle body fuel injection which the fuel mixture is controlled by a computer.
If I were to start shooting parts at this Blazer I would put a new O2 sensor in it.
If you don't want to guess, find somebody with a OBD I scanner software to look at the serial data. unfortunately that also means a PAT(PROFESSIONAL AUTO TECH) that can understand what the data means.
the only code that came up was map sensor and it all check out ok I replaced o2 sensor tody still the only thing I found puzzling was where they line from the fuel vapor canister goes into they intake on the carp body nothing change when I took it off to check it.
The purge system is fed at the throttle body. It goes from the throttle body to the purge control solenoid then to the canister.
If you had a scanner that will pull codes what did the serial data look like?
had the codes check and it read map sensor had it check and everything was fine. I'm thinking TBI cleaning and go from there thanks
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