help plz

[hiltont]

I just bought a 08 dodge big horn 5.7 hemi. truck came with the diablo tune I didn't like the way it was shifting so I starting messing with the tuner. it would shift at higher rpm's. I went fact to factory now when I start to easy on the gas it is like sputtering even when I am going 55 or so. I also have a cold air intake and k&n filter. I have never used a tuner and probably never will again

[mikel]

you mean its sputtering with the stock tune?
if so, its not anything you did with the tuner, check for a loose plug wire, coil, etc...

[Mike_Levy]

I have had a Predator on my 08 Ram Hemi QC since it was almost new. Never had any issues.
You can adjust the part throttle shift points lower if you want.
As for the shutter, how old are the plugs? They need to be changed every 30K miles. They are copper core plugs. Only use the OEM Champion or NGK V-Power copper plugs for the best performance.

Have no choice but to use stock plugs. Other plugs have the wrong resistance and activate the auto shutdown relay. Turns the motor off randomly.

[AZHEMI]

Correct just you the copper core plugs...I just replaced my plugs and had 96k on them ran like crap... change them out runs great--E3 plugs I have had to replace on my friends ram cause it fried master coils on cylinders 2 and 6. And the copper core plugs are like 1.99 and ya need 16 of them.