My 02 FX4 accelerates when I push in the clutch and take my foot off the gas, to shift or to slow down. This lasts for a couple of seconds and then it goes to an idle. My truck is also rough idling. Any suggestions

Maf and iac. Clean them. Should help.also have you changed the plugs and wires if not I'd do that too.

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2006 Ranger. 2.3l 5 speed
Air box mod and throttle cable mod.
Tri-fold tonneau cover. VHT taillights. Tinted corner lights.
fog lights.black headlights.
LED driving lights, dome, 3rd breaklight, LED tailgate light bar and LED foot wells. LED tails.
4.10 stock gears[/COLOR]

My Build:

http://www.fordrangerforum.com/proje...ger-build.html

The truck physically accelerates or the rpms rise?

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The RPMs rise.

My 02 had symptoms similar to that. I found a leak/crack in the line the goes to the PCV valve. I replaced the hose and PCV valve and the problem went away.

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2006 Dark Shadow Grey Sport Extended Cab 4x4 - 4.0L V6 - 5 Speed - 4.10 gears
31x10.5 Goodyear Wrangler Duratrac's (Summer) - 265/75 Cooper Discoverer M+S (Winter) - 15" Dick Cepek DC-2's
Toolbox and Access Tonneau Cover - Lightforce Striker 170 Lights - Level II Tow Hooks
Build Thread
Previous Vehicles: 2002 Red Ford Ranger Edge 4x4 - 1997 Arctic Green Ford Thunderbird LX

I cleaned the MAF and it is still doing it. How do you clean the IAC as suggested? I've got Throttle Body cleaner. Can I use that?

What did you use to clean MAF hopefully only MAF cleaner. Unplug IAC un bolt IAC clean holes out as best as you can, ive used q tips to help the process, let dry and reinstall if it continues it could also be the Throttle position sensor which you can only replace. Others have used throttle body cleaner but i use MAF cleaner myself.

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2003 XLT FX4 Level II
Painted skid plate, Pioneer double din, painted radio bezel/door handles, headlight mod, throttle cable mod, Gibson cat back, afe cold air, 06+ fender badges, Remote start, 06+ mirrors,06+corners, 35W DDM HIDs 4500k head and fog lights,polished alcoas

I cleaned the MAF with MAF cleaner. I just cleaned the IAC with Throttle Body cleaner and it is definately running better. But it is still revving up when I'm driving and push the clutch in when going thru the gears. It revs up to 2200 RPMs with the clutch in and in neutral.
I'll try cleaning the Throttle Body next.

Sounds like tps to me, happened to my 96 explorer at start it would rev high then as I put it into gear it would go down. Sounds close mine was auto though so there was not as much Reving between gears.

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2003 XLT FX4 Level II
Painted skid plate, Pioneer double din, painted radio bezel/door handles, headlight mod, throttle cable mod, Gibson cat back, afe cold air, 06+ fender badges, Remote start, 06+ mirrors,06+corners, 35W DDM HIDs 4500k head and fog lights,polished alcoas

Does anyone know how to get to the PCV valve? Or where it is?

Back of the drivers side valve cover. Up against the firewall.

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Curent 2003 Ford Mustang Mach 1 owner - Build Thread for her: Logan's 2003 Mach 1

Former 2003 Ford Ranger owner - Build Thread for her: Project Budget Buster

Thanks for all the suggestions everyone. I'm going to check the PCV, clean the Throttle Body, and eventually replace the plugs and wires. I'll let you know how it goes.

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2002 FORD RANGER FX4

Found some time to do the quick Fuel Starter test of the PCV. The engine never revved so I'm going to assume there is no leak. Does anyone disagree? Hopefully this weekend I can get to cleaning the Throttle Body. But as rough as the truck is idling i don't think that is it. Looking to replace the Spark Plugs and Wires when I find time.

Cleaned the Throttle Body but the truck was still idling rough and reving the RPMs. While I had the 4.0 cover off, that's over the Throttle Body, I could hear air. After looking for a while and moving the big hose from the radiator out of the way, I found a 90 degree rubber elbow hose that was cracked and leaking. It comes out of the Throttle Body on the passenger side, runs towards the firewall and I believe wraps around to the PCV valve. Went to the local Autozone and got a replacement and the truck is running like new now. Thanks for all the suggestions from everyone.