A vacuum leak (Brake booster).
Park on a transmission is a gear that allows the transmission to idle as if its in neutral while locking the drive train to prevent the vehicle from rolling.
the reason it are doing that is because in is ild to low
Why does my 2000 Pontiac Grand Am, with a 2.4L engine, run rough at idle but runs normally when placed in neutral? I changed the plugs and air filter, but the problem continues.
Bad oxygen sensor
Fuel injection or fuel contaminated?
No, you may have to check your idle. You can change the idle so when you put it into gear it will not die. You must make sure that the engine is warm when you adjust the idle or it may make it hard to start when the engine is cold. When it idles in park or neutral it should sound a little higher than when it it idles in gear or drive or reverse.
good gear
good gear
Could be a very dirty fuel filter.
MAF senso, or transmission fluid.
The proper idle speed for a 2000 Nissan Frontier V6 is between 700 rpmÊand 800 rpmÊin park or neutral. In gear, the idle speed should be between 650 rpm and 700 rpm.
check the idle speed with the car in gear, if it has a tac on the dash it should idle in gear at about 700 rpm if its too low the car will vibrate or stall.