Mileage plummeting, full tune up time

[Catchin Zs]

Alright so tomorrow I'm gonna go out and buy everything I need for a full tune up on my hemi. I realize I do have a 6' lift with 35's, but I'm getting 9-10 mpg in town with my superchips and cai and it's hurting. Please add anything if there are more causes to a sudden drop in mileage. I can buy all of this at autozone, right?
So far it's:
Oil and filter
Plugs and wires
Seafoam
O2's
Coil packs?

 

[Hemi450hp]

No need to replace o2 sensors or coil packs unless they are throwing codes. Start off with the fresh oil, plugs, and wires. Also, clean out your air filter.

 

[GhostRam94]

And your tb

 

[Catchin Zs]

Will do. I have 124k on the truck. Pretty sure the 02's are stock, sure it isn't worth a try?

 

[iSlacker816]

And your tb

x2. If its that bad after wards you may want to look at putting gears in. Help turn them 35's

 

[SmokedRam]

Will do. I have 124k on the truck. Pretty sure the 02's are stock, sure it isn't worth a try?

You're right at the mileage where they should at least be checked and/or replaced. I wouldn't bother replacing the post cast sensors, but pre cat sensors, yes. Just because I would rather replace them before a MIL is lit. Also, stay away from Bosch O2 sensors, use NTK or buy OEM.

 

[Catchin Zs]

Well it was about 12-13ish before I put the lift on. Figure that the lift gives it more air resistance. Gears are on the list but will not be for awhile, as much as I'd love to do them right now.

 

[KGBIGCOUNTRY]

Looks about right on your list

 

[Catchin Zs]

What's the best oil and filter for these trucks?

 

[KGBIGCOUNTRY]

I have always ran a Mopar filter on my 04, the wifes 05 gets either a Mopar or a Napa gold just depends on if im doing it or her dads shop. Oil on my new motor is Mob 1 full syn.

 

[Catchin Zs]

Got some intake cleaner today and looks like mobil 1 it is.

 

[smiley]

Wires would be waste of money unless there is a code too I believe.

 

[Catchin Zs]

Cleaned my intake filter and my tb today. Tb was FILTHY. Been awhile since I cleaned it... plopped em back on to the truck and good night that throttle is peppy Oil change and more tomorrow

 

[RompinRam]

I need to do this! My tb is filthy

 

[Catchin Zs]

Have you grounded your tb? If not, do it. Now.

 

[TexasRammer]

that wont help his

 

[Catchin Zs]

Why?

 

[TexasRammer]

the older 4.7's are cable controlled throttle bodies

 

[Catchin Zs]

Lol I stand corrected bud.