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My 1999 ford ranger bucks at cruising speed, What should I…

Customer Question
My 1999 ford ranger...

My 1999 ford ranger bucks at cruising speed, What should I look for?

Mechanic's Assistant: What's the make/model of your device? How old is it?

1999 ranger with a 3.0 litre V-6

Mechanic's Assistant: How long has this been going on? What troubleshooting have you tried?

It,s been doing this for 9 months. I replaced the plugs, fuel filter, coil pack and now the TPS.

Mechanic's Assistant: Anything else you want the electronics expert to know before I connect you?

Not yet, let me chat with him OK?

Submitted: 11 months ago.Category: Ford
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Answered in 4 minutes by:
8/6/2017
Ford Mechanic: kalamykid, Shop Owner/ Tech replied 11 months ago
kalamykid
kalamykid, Shop Owner/ Tech
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Satisfied Customers: 5,517
Experience: I HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY Q
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The first thing you should look for will be a vacuum leak. A vacuum leak will cause a lean fuel mixture and also cause a high idle.

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Customer reply replied 11 months ago
ok, I had the throttle body off without replacing the gasket, maybe this is the leaking area.
Ford Mechanic: kalamykid, Shop Owner/ Tech replied 11 months ago

That can be. If you use a can of carb cleaner, you can spray small bursts around the intake, throttle body and any where there are vacuum lines. If the idle changes, that is where your vacuum leak is.

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Customer reply replied 11 months ago
ok, that would explain the high Idle but what could cause the bucking at cruising speeds?
Ford Mechanic: kalamykid, Shop Owner/ Tech replied 11 months ago

The lean fuel mixture can cause it, so the vacuum leak can be the root of all your problems.

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