Rough idling n stalling

I had my car to the shop about a week ago. Because my valve cover gasket needed changed. So my son who was driving my car. Said the valves needed adjusted. So I dropped it off an the next day they call my son. An said your car is ready. So I go over to pick it up. He said he replaced the valve cover gasket n adjusted my valves. An did a oil change. So I drive it from the shop to get oil n come home. Then we take my husband truck over to get manifold gasket changed. At the time car was running fine. So later that day. They call to say your truck is done. So we get in my car an it idles rough. Then check engine light comes on. Then I go to put it in reverse an it dies. So I start it up n it dies. Then I start it up again an try to put it in reverse an finally get it to where I drive down the road. So we get over to pick up my husband truck. An I tell the mechanic what it is doing. He says put upper grade gas in it. So I get half way home an I stop at a stop sign. An while I was waiting for my son to turn in his dad truck. My car dies. So I finally get it home. An I try to go to the store the next day. An it won’t stay running. I go to put it in drive reverse it dies. I gotta have my foot on the brake an give it gas just to be able to move it up in my driveway.