June 15, 2010Whats up fellas, I have a 2002 1500 Z71. Over the passed couple months I have noticed drastic changes in power output. I first thought it was bc the sparks needed to be changed (bc I have over 113,000 miles) before I changed them, when ever I tried giving the truck a lot of gas it would rev high and a rattling noise would come from the engine at peak rpm. At that point the check engine light would flash on and off for a couple minutes, but would never stay completely on.
Just last week I changed the plugs and wires my self (AC DELCO and DURALAST) I also gapped the plugs at the required gap. After the tune up I test drove the truck..It sounded great like I had new exhaust (not sure what that means?)...but when I put the pedal to the metal the same problem happened..revs high with a feeling of little power and the rattling noise at peak rpm and the C.E.L. flashed on and off once again. Nautrually I was ******* PISSED so I took it to the nearest shop to check for codes...NO CODES FOUND...
..also failed to mention that my truck is getting horrible gas miledge before tune up and even a little worse (it seems) after.
Ohyeah it also WILL NOT want to go higher than 65-70 MPH, it is a huge pain trying to drive in the north ga mountians. It can barely make it up hills so its having loss of torque.
HELP WOULD BE GREATLY APPRECIATED!!!!! Thanks