No power

[chopper]

I have an 03 with 81000 miles on it and it just seems to have very little power when pulling a hill also it down shifts to a much lower gear than needed with the tach going up to almost 5 grand, I had new plugs an wires installed but still runs the same any ideas would be helpful Thanks

[timgco]

check for DTC's to start.

[H2 Bill]

After you check for any codes run some Techron through it for several tanks of gas.

[GRTWHT1]

:iagree: For a quick fix the TECHTRON is a great product. Sounds like a computer malfunction though by the way your describing the problem.
I had a similar problem in my SS silverado when I replaced the chip with the stock one prior to selling it. I took it to the dealer and they "re-flashed" it and after about 1/2 mile down the road it went back to normal.