90 GMC Searria

Do you have a check engine light? Don't recall last tune -up start here and see what happens

I just had the spark plugs replaced, new spark plug wires, new fuel pump. I had this issue before I had all this done. Thought that fixed it. The shaking comes and goes. When I rev it up it seems to go away. It happens when I come to a stop and is slow to take off but runs fine once I get it going. Could it be the transmission?

Check and test the throttle position and manifold absolute pressure sensors-also the EGR valve