1992 4runner egr problem code 71

My engine light came on so I had it checked it states code 71 which is the egr system should I change the egr valve first? It could also be the egr gas temp sensor. Any help would be great thanks. Jaz

My engine light came on so I had it checked it states code 71 which is the egr system should I change the egr valve first? It could also be the egr gas temp sensor. Any help would be great thanks. Jaz
THIS IS VIRUSOUT,I TRY TO PULL U OUT OF THE HOLE THAT CAN COST U MORE THAN $300+,BUT STILL NOT CORRECT THE PROBLEM.PAY ME OK!LOL.
EGR VALVE THAT HAS VACUUM HOSE THAT CONNECT TO EGR MODULATOR ,CHECK THIS MODULATOR,IF IT CLOGGED REPLACE IT,FROM MODULATOR HAS VACUUM GO TO THROTTLE PORT,CHECK THIS LINE FOR CLOGGED ALSO,FROM EGR VALVE HAS VACUUM HOSE CONNECT TO A LITTLE VALVE THAT CALL VSV(VACUUM SWITCHING VALVE),CHECK THIS VALVE,THIS MAY CLOGGED,THIS VALVE HAS SENSOR THAT REPORT TO ECM,ALSO AT EGR VALVE THAT HAS TEMP SENSOR SCREW INTO IT,WILL REPORT TO ECM THE TEMP THAT EGR VALVE .IF FOR SOME REASON HAS NO EXAUST GAS THAT GO THR,ECM WILL SEND THE CHECK ENGINE LIGHT ON TO ITS OWNER,EVEN IF U RESET,IT WILL CALCULATE THE TIME DEPEND ON U ENGINE RUN RICH.THIS INFORMATION MAY HELP U AND SAVE A LOT OF $ AS U ALREADY KNEW.FEED BACK TO AF FOR THE RESULT.

I know it sounds simple but my 1995 4Runner did the same thing and I found one of the vacume hoses was broken. In my case it was one that fed from the top of the throttle body around to the egr. Check carefully and replace the old hoses.