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

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?

by in Phoenix, AZ on August 17, 2013
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1 answer 5 comments
ANSWER by , August 17, 2013
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.
COMMENT by , August 17, 2013
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.
COMMENT by , August 17, 2013
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?
COMMENT by , August 18, 2013
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
COMMENT by , August 18, 2013
That vehicle will provide more than just codes. What does the data stream look like.
COMMENT by , August 19, 2013
I pulled the TBI off and cleaned it, was all clogged up seems to run good down, thank you