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DanoD,
The only adjustment screws are on either side just behind the front float bowl. These two screw are only for idle upto about 1200 to 1500 RPM. Start your truck and you will have to idle it up to adjust them turn them in all the way and quickly turn them outward 1 1/2 times. That is where you should start for the fine tuning. Then start turning each of them (one at a time) in either direction, until the idle is smothest and the RPMs are the highest. Once done if this doesnt fix your problem that your having, You may need to change the jets either up or down. Those are not adjustable and you will have to buy different sizes. Check your plugs and see if they are running rich after you adjust idle crews mentioned above. If they are running rich then use smaller jets. Running lean, bigger ones. Hope this helps.....Short/Step
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