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Altanator is putting 14.5 volts but my dash gages are showing 10

I noticed my truck (93 1500 chevy) is reading 10 to 12 volts at the dash and when i checked the alternator it is reading 14.5 .I also have a problem with idle it seems like it is miss firing once and awhile .idle in gear is around 500 .I have a new battery ,starter,cap,rotor,knok sencer ,coil,and nothing has changed .I disconected the posative on the battery and put a test lite between pos on bat and termanel to see if I had a short and there is no short .I also checked the code and its reading 43 , from what ive read on line this seems to be a mistury code no one can fix. The truck wants to stall when im at a stop . Ive noticed even when ime driving the volts meter still reads 10 to 12 volts . Ive posted the problem once already but this is a better discription of my problem .two weeks of serching my truck and the web and still not fixed PLEASE HELP....................................

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