Please help me I am getting a very high idle and a po441 code

My 95 blazer runs fine and then all of a sudden it will start to idle very high and the light will come on for a purge flow fault? I have had nothing but problems with this car I get check engine lights all the time for thing I have already changed like my iat sensor tps sensor and stuff like that but it comes up low circuit?? I changed my head gaskets and completely redone my front end I just dont understand this please help??

P0441 is a purge flow fault. Certain faults related to it can cause high idle. It could be caused by the purge solenoid, (on the intake manifold) or the canister purge vent solenoid, (under the vehicle near the purge canister) or any of the electrical, mechanical, or vacuum lines involved with them.