will the po600 code for 97 nissan maxima make car idle high

Question

I REMEMBER THAT CODE IT CAME UP WHEN I HAD OBD11 HOOKED UP MO O/D LIGHT HAS TO BE SHOWING ON THE  DASH OR THE CAR WILL START JERKING OR PUTTER AN IT HARD TO ACCLERATE I HAVE TO GRAB THE GEAR AN KEEP MOVING IT BACK AND FOURTH TILL THE O/D LIGHT POPS UP BUT WHEN I GET ON FREEWAY AN PRESS THE OD BUTTON ITS FINE NOW THE CAR IS IDLE EXTREMELY HIGH EVEN IN N POSITION COULD THIS BE BECAUSE OV THAT PO600 CODE

Answer 1

P0600 ECM receives incorrect voltage from A/T control unit continuously

Yes this code can cause this condition or at least contribute to the condition that you have, Try this disconnect the ECM (with the battery disconnected) and reconnect, same with the TCM if there is high corrosion simple disconnect and reconnect would help to eliminate any corrosion at the connection