Car has been in the shop all week getting the radiator replaced along with the timing belt, water pump etc. and had the valve cover gaskets and cam tensioner seals replaced. Pretty extensive work. I had a friend pick up my car due to me being out of town. I got back today and immediately wanted to check everything out and I am noticing a serious power loss. At first I thought maybe it is the Texas heat just cutting the power but I did the "redneck" ecu reset by unplugging the battery. After turning it back on and driving it, the power was back at the level I remember. After a few minutes it went back into what I would call limp mode. No check engine light. Want to run a scanner and see if there is any codes. Any suggestion on what it could be? Obviously it's going back to the shop to get it checked out but I was going to see if anyone had a similar experience and suggestions.