I had no problem with stock Champion plugs, but I've also had no problems with NGK V-Power (ZFR6F-11) plugs.

 

Yeah, mine didn't like them either. Even with a tune. Ran rich and mileage and power went down. They did idle butter smooth though.

Best plug I ever tried was the Champion Truckplugs 4071 stock heat. Man, they were great! But of course, like free TV and Super Size fries, they were discontinued. Why do all good things have to disappear?

 

It had Bosch plugs in it when I went to do the tune up. To my knowledge it doesn't have a tune on it. When I first got the truck it was getting roughly 8.5 to 9 mpg. Basically had no power. It was straight piped after the cat. Put a muffler on it got a little better. After the tune up I'm sitting around 12-13 in town. Better throttle response. Basically like a new truck. Also put a stage 3 clutch in it. Working at O'Reillys gives me a few options on what to get.

 

I'm shopping clutches. Which one from Oreillys did you use? Did you go 11 or 12"?

 

Went with the 12" clutch. Had the commercial guys order me one from Tennessee clutches. Out of Nashville. Apparently from what I have been told by co-workers power torque brand is junk. It was a Sachs clutch they ordered me.

 

Post more specs on your truck. Unless it's a 4x4 with a 360, mileage should be a lot better.

 

Sachs makes the stock clutch iirc.

 

As far as I know it's a stock 5.2l 2 wheel drive with a 5spd. Extended cab short bed. Flowmaster 40 series muffler. LT245/75/r16 around it. Anything specific you need to know ask.

 

FWIW, I've been running Delo 15-40 for the past 50K miles with zero issues....would it be my first reccomendation? ( Rotella too )

No.....I came across a drum for essentially free, so been using it...$5 oil changes kick ***.

If you have good oil pressure and no valvetrain noise, just run the 10/30 you have been.

 

I run Rotella T5 10W30 and Champion Coppers