I have a p0507 trouble code on my 1999 pontiac montana, how do i fix it

This code is not easy to fix as it can be caused by at least 6 or 7 different issues with the evap system. Read about the code and poss issues that cause it at the link provided. P0440 OBD II Trouble Code Evaporative Emission Control System Malfunction...

This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set. A P0507 DTC trouble code may be caused by one or more of the following: A vacuum leak Leaking air intake after the throttle body EGR valve leaking vacuum A faulty positive crankcase ventilation (PCV) valve Damaged/failed/dirty throttle body Failed EVAP system Failed IAC (idle air controller) or faulty IAC circuit. This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect the intake air system for air or vacuum leaks and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns. If you have an advanced scan tool that can interact with the car, command the idle higher and lower to see if the engine responds appropriately. Also check the PCV valve to see if it's blocked and needs to be replaced. Check the IAC (idle air controller) if equipped, verify it's operation. If available, try swapping in a new throttle body to see if that fixes the problem. On Nissan Altimas and possibly other vehicles the problem may be fixed by having the dealer perform an idle air relearn procedure, or other relearn procedure

This could be because the emissions control system does not come online till it get hot. So you are not getting codes. Replace the oxygen sensors, you are supposed to about 65000 anyway.

P0102: you need to make sure the sensor is clean; sometimes it get dirty as you are working on an old car. Check the voltage manually. Make sure there is no air leak near it

P0507: high idle... this sounds like a vacuum leak. get starter fluid and start the car. Spray around and check for change in car idle

Call your local dealer they will have you push and hold two sets of memory buttons that will show a code then give then that code and they will give you a code to unlock the radio.

if you aretalking about a shift solenoid it is in the transmission pan

P1483=engine cooling system performance
Are you adding coolant each time this light comes on in the coolant reservoir?
if so,you need to find where it is leaking out,

P1133 .......Oxygen sensor bank 1 sensor 1.