Yes, that is certainly a possibility, but there are others too. Unfortunately, there is no way for me to know for sure without replacing the wires and seeing if the vehicle runs better.
Unfortunately, running the car with the wires hooked up in the wrong order can damage your engine, so I have to strongly recommend you not start it again until you have confirmed they are connected in the right order. The fact that your shade tree mechanic worked on four of them at a time alarms me even more. He should have worked on them one at a time.
I feel as though I cannot over-stress the importance of making sure they’re connected in the right order. It’s not hard to do, so there is no downside to confirming it.