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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 12-18-2007
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Low rpm stumble

My 4.0 has a bit of a low rpm stumble to it. Around 1,500-2,000 rpm under load the truck starts to buck/ stumble. I've cleaned the MAF, changed plugs/ wires, unhooked the EGR to test, and replaced an O2 that a scanner said was bad. Does anyone have any ideas on what it could be?
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Old 12-18-2007
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My first thought was plugs. But I take it none of those items you replaced changed anything?

If so I'd look for a vacuum leak or *maybe* the coil.
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Old 12-18-2007
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A/T or M/T, are you still running everything on that truck stock?
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Old 12-18-2007
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Nope...nothing really cleared it up.

Yes, the truck still has all of the stock accessories. It has 103k on it and it's a manual (just purchased from the original owner).
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Old 12-19-2007
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Have you looked into the tps check that w/ dvom on a slow opening koeo and see if there is a hesitation unless you have can use a scope or a vantage.
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