Will Not Idle

[raginbronc]

I just bought my 1st Bronco its an 87' 4.9l w/ 110,500 miles. When i start it, it will not idle in park it just cuts off. But it will idle in reverse and drive. what could be wrong.

 

[Shadow_D]

Welcome to the "B Zone"!

First thing you should try is doing a tune-up i.e. Plugs, Wires, Cap & Rotor, O2 Sensor, Fuel Filter & Air Filter.

If you are still having the problem then you should check the coil, EGR Valve and Vacuum lines

 

[Justshootme84]

Since it is EFI and computer-controlled, I would scan for any codes. Alot of problems come from the IAC (Idle Air Control) valve and EGR (Exhaust Gas Recirculation). Also, check the timing on the motor.

 

[Guest_raginbronc]

I removed and cleaned the IAC valve. Idles just fine now. thanks for the help....