i have a mazda b2500,everyone says its basically the same truck as the ranger so i decided to come here. but yea when i start it up it shakes a fair amount,but once i get it above 1500 rpms it settles down and runs fine. i no im being very vague but thats really all the info i have at this point.

Maybe it has diabetes and shakes b/c it's sugar is low.

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1992 Ford Ranger STX 4x4
4.0 Liter (6 cylinder)
"When I grow up I want to be an F150"

im no expert but im sure a car with sugar in it would be a problem

How bad does it shake?

could be the IAC just needs cleaned possibly

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it shakes a good amount. its very noticeable. but once it gets passed 1500rpms it runs perfectly.

EDIT: i also just replaced all the spark plugs last week. the amount of shaking went down after we replaced the plugs but its still noticeable

Clean your MAF and IAC and see it that helps any

What year truck and engine do you have

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its a 99,4 cylinder.not sure of the actual engine but i will find that out tomorrow when we work on it more.