2008 H2-Check Engine Light

[clinecs]

Have a 2008 H2 that I bought in Nov. Having problem w/ Check Engine Light coming on quite regulary. Claims to be something w/ the Fuel Sending unit. Have been going down the Expressway to have the engine retard itself and not go over 2000rpm's and 35mph. Ended up getting towed to the shop. They couldn't find anything really wrong, finally said they found a wire w/a knick in it that supplied the relay for higher rpms???? Supposedly fixed it. Took it home and didn't have any problems, but about a month ago, light came back on and again test said fuel sending unit not properly reset?? Said I may experience power loss. Drove it and light goes off. Light is now coming on and then going off in a couple of days. Anyone else having this type of problem? Today it decided to retard itself again while driving. Made it to the side of the road and turned the car off and then restarted it and runs fine. Will be taking it into the shop tomorrow. Curious if anyone else was having this type of problem.