SOURCE: 2004 Ford Ranger Low Idle
I figured out what was going on. supposedly on ford rangers the Idle Air Control Valve (IAC Valve) goes bad. i got a trouble code looked it up and sure enough it is the IAC Valve. Under 100 bucks for the part
SOURCE: low idle
Most often, dirty or faulty 02 sensors will throw off the idle. The 02 sensors and camshaft position sensor basically control all the idle. If TPS was dirty or bad, you would have some hesitation when giving some gas. Bad plug would cause lack of power or misfire.
SOURCE: 2001 ford explorer sport does not idle when cold
If engine is actually running lean,could be clogged fuel filter or weak fuel pump.
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