IAC maybe?

[ChevyTech]

The module in the distributor is a common failure part but that does not fit the hitting a pothole scenario. These do get problems with the connection where the wiring plugs onto the module on the outside of the distributor which does fit with hitting bumps.

First thing that comes to my mind is the jolt affecting the fuel pump. It is common for the hose between the fuel pump sender and the fuel pump to get mushy and leak. The jolt could be affecting that hose. These hoses seem to fail from a vehicle that sits a long time without being driven.

The ignition switch on the lower area of the steering column can get worn and lose connection from hitting bumps.

It would be a good idea to check for trouble codes which can be done without a scan tool or code reader. Here is a link on checking codes.
https://www.chevytalk.org/fusionbb/s...php?tid/273660