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Q: egr valve isn't opening.what would cause this issue. on 1993 Ford F-150 Lightning

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i just went to my local repair shop to see if the check engine light thats on is still reads the egr valve.it does.the scan machine he used said egr isn't opening.what would cause this to happen.he also pulled the vaccum line off egr to see how much suction was there.an he said there wasn't much.it idles a little unsteady.but it i drives without any issues.if valve wasn't opening wouldn't truck be running alot worse then it does.i mean idle wise.
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The EGR Valve will only have vacuum to the valve under certain circumstances, and never at idle. EGR systems can have carbon deposits accumulate in them and clog up, and this might be what is happening. If the valve was open at idle you would have a rough idle, but you probably wouldn't notice it otherwise.
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