My Engine hesitates going over bumps, it seems electrical. So I opened the hood and tried checking all the grounds, plug wires, etc. Nothing seemed to give any problems So I then tap lightly on the power distribution box, and everytime I tap it, the engine starts to stall, just like when going over bumps.

Just a couple relays in there, as well as a few fuses. Any idea how to proceed? Shouild I just start replacing relays? Look for a replacement box at the junk yard?

 

I'd do a lot of inspecting and wiggling, while it's running (or use a test light to see when the power flickers).

This could be a simple as a bad contact for the PCM or FP relay, bad feed wire/terminal to the box, bad relay itself, etc.

I'd suggest pulling the PCM Power Diode and checking its contacts too. I've heard of them coming loose.