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Old 03-14-2011
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heavily pulsating idle

3.0 2000

somedays when im leaving the parking lot after school the truck runs fine. but others it seems as if shes not getting fuel and when i press the gas she bogs down temporarily and them jumps to 2K rpm. then at a nearby stop sign i can hold the brake and watch the rpm go from 200 to 1300 in about 1 second then back down and up and down. any ideas on whats causing this? it seem sto fix itself when it get warm under the hood and has been running for a solid 5 mins
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Old 03-14-2011
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Idle Air Control valve. clean that out with some brake and parts cleaner.
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Old 03-14-2011
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done that. multiple times actually. cleaned the entire air intake system from box to throttle body. and replaced parts from fuel sender to fuel filter to ijectors.....im very confused as whats wrong
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Old 03-15-2011
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Check plugs and wires next.
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Old 03-15-2011
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ok wires are in good repair. boots nor base nor core are damaged or cracked or ripped. and i personally replaced plugs not but 6K or less ago. and more Ideas? thanks..ill eventually find it with your help haha
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Old 03-15-2011
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MAF?, someone else might give a little more insight. mine used to do this, but it was just the MAF and IAC
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Old 03-16-2011
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I had this same problem on a 1998 Japanese Ford Mondeo. I only owned it for 2 months before I sold it, so I didn't really look into the problem, but my suspicion was that the transmission fluid was old and dirty, making it more viscous than it should be. This kept the torque converter from turning freely when the wheels were stopped. And sometimes if I came to a stop suddenly, the engine would stall because the stopping wheels would be too coupled to the engine via the transmission and torque converter, as if I was driving a manual and tried to stop without stepping on the clutch. It was the worst on cold mornings, but it would quit doing this once it got hot enough to reduce the viscosity to somewhere in the normal range.

Later I described the problem to someone and they told me it was probably the idle air control valve, though my explanation was also possible. Since you already checked the IAC, check if your transmission fluid is still good.
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Old 03-16-2011
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Check the PCV Valve hoses.
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Old 03-16-2011
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I had this problem. MAF sensor went T.U.
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Old 03-16-2011
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thanks for replying guys!

- ok so advance says it is throwing a MAF sensor code. cleaned it down and not throwing it no more. good stuff

- tranny fluid. didnt get around to checking it today but if it happens to be bad how do i go about changing the fluid out? is there a plug? and how much fluid does a 3.0 take? just some info would be awesome

- PCV valve. that went bad on my truck years before i had it. the guy i bought it from told me that it threw a code and was shot so instead of buying an entirely new part he disconnected it and no more problems...not out of the picture though!

thank you for info on tranny fluid change
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