Kinda of new here guys. 1999 2500 5.7 4x4 4:10 Huges Plenum kit, new aftermarket cat converter and fuel sync bumped to +5.

Wife and I just bought a new camper 6500 pounds dry, Truck did ok on back roads 30 to 45 mph...Once on expressway I could not even get her up to 60 let alone maintain 55. Wehn you put your foot in her you hear that growl like you opened the 4 barrels on a carburetor but nothing happens but the noise. Any Ideas? I would think this truck could handle this with no problems..

 

How does it run without a camper behind? How long has the plenum been fixed and who did it and did it make the trucks performance improve? When was the Cat. Converter replaced? I don't know what a fuel sync bumped to +5 means so please enlighten me.

 

Run fuel sync back to zero. That isn't helping you.

+1 on checking the cat.

Not towing in Overdrive are you?

 

I do all my own work,It feels a bit sluggish even with out the camper. cat was about 2 months ago and the plenum kit was about 3 weeks ago, No I noticed no improvement from plenum kit it was more of a maintenance deal. Fuel sync it the timing of the injector spray relative to position of valve. From what I have read guys are changing this from 0 to 5 for performance gain.

 

The truck can handle it but the motor will be working to tow this size of load. Make sure O/D is off when towing. What size tires are on this 2500? Has a comp test been done to the motor to see what shape its in?

Reset the fuel sync to 0

 

First I've heard of it......

5.9 engine, right? How many miles on it? Done a compression check?

 

If I turn overdrive off even without camper it turns 3000 rpm at 55 mph, what do you mean +1 on new cat? yes 5.9 never had compression ck... 9700 miles facrory tire size

 

I will reset fuel sync for sure

 

Did the truck ever run well since you have owned it? Did you perform a complete tuneup lately or while you did the plenum fix?

 

plugs, wires,cap rotor and distributor and coil are new, what should compression be ?