Odd Issue with 95 4.3 4x4 Sonoma

J.Z

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I have a 95 4x4 4.3 Sonoma that starts normal but than revs to 2000 pms and then 1000 rpms the engine sputters..any ideas? New battery,previous owner put new fuel pump but a ground wire was cut so I fixed it i also replaced the plugs. Update 0824: I have replaced the iac valve, tps sensor and the belt which caused the truck to be more
quieter than before however it now idles at 1000 rims and no more revving but it drops below 1000 rpms and sputters as if it’s gonna die out but than revs back to 1000 just to repeat again. Any ideas? Maybe fuel injectors?
 
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