My 93 z24 blew an ignition module. After replacing the module the car didn't have the power it had. Three days later I started hearing a loud buzzing from under the hood. Started running like crap. Found EGR (digital)valve bad...black soot all around valve, broken seats.
Replaced EGR valve and gaskets. Now car idles OK but when you step on the gas, you can hear the EGR valve buzzing again. Still has NO power...

Pull the vacuum line off of the egr valve and see what happens

There is no Vac. Line on the EGR, it is an electronic valve. Take it in and have a back pressure test done