1998 Dodge Ram 1998 Dodge Ram 1500 sensor issues?

I recently fixed the water pump on my truck (360 5.9L) and after I put everything back together, I started having issues with one of my sensors (not sure how those would be related). I took it to the local autoparts store for a basic diagnostic and they said one of the sensors was coming up as an issue, but didn't/couldn't specify which one. Since then they cleared the codes and the check engine light is no longer on and the codes don't come back up. I have cleaned the MAP and speed sensors with the proper cleaning agent, but the truck still isn't running right. My truck will not shift in the right spot (will shift at higher RPMs) and has a loss of power when going up hills and in overdrive. The engine runs real strong, but something is not telling it to shift when it needs to. The idle also seems a little lower than normal, but not bad or rough. I did some online research and the symptoms seemed synonomous with a corroded MAF sensor, but I'm pretty sure my truck doesn't have one. Could I have disrupted one of the sensors when I was working on the engine? If so, which one would show these signs? What are these symptoms typically associated with? I'm very curious why changing the water pump would cause these issues (however I was working in the area of the sensors). I greatly appreciate your time and I anxiously await your answer.

Trevor