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Vacume hose(s)/system problem, or dirty fuel filter would be my first 2 guesses.
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∙ 18y ago
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Why does your 1999 ford ranger idle up and down while in park?
It sounds like you have a vacuum leak from either a vacuum hose or a leak or crack in your intake. Check for hissing sounds.
Why does your ford ranger idle go up and down upon start up?
The IAC (idle air control) at the throttle body is usually the problem.
How do you lower the Idle on a 1999 Ford Ranger 3.0 Liter Engine?
The engine is EFI so the idle setting is computer generated. You'll need and engine programmer to change this setting.
How do you slow down the idle speed on a 1999 Ford Mustang?
With a tuner. Look into Diabosport or SCT.
Whats causing your 1992 ford ranger to idle to fast?
water pump or thertomstat
Where can you find the idle air control valve on a Ford Ranger?
The Idle Air Control (IAC) valve is mounted on the throttle body
What causes high carbon at idle on smog check 1995 ford ranger 2.3?
ford suck. go Chevy
Why would 1993 Ford Ranger V6 3.0 chug when accelerating and idles up and down when sitting to the point of almost dying?
A good chance its the Idle Control Valve
1994 ford ranger 4 0l xlt 5 speed manual trans when you start engine it has an adnormally high idle and takes 30-40 seconds to idle down and then when you hit the gas it does the same thing again?
Sounds like the Idle Air Control valve.
1999 Ford Escort idle air control valve?
go to autozone.com
Where is the idle screw on a 2001 Ford Ranger XLT?
There is no adjustment you should mess with. The ECM maintains the correct idle unless you have problems like vacuum leaks.
Why does the 89 ford ranger idle at 1100 rpms?
Throttle plate may be stuck - try to free with a screwdriver
