hey i have a 96 accord and i have a question what is the problem with my car when i start the car but i leave it on for a while and the rpm needle goes up and down and it is not below 1000 rpms so what is the cause of this problem and also where is the evap control pressure switch located because my car failed emmissions and it also has a bad egr valve and also a bad oxygen sensor so how much will this all cost to fix before i take it to the emmisions test again.