My 4runner is really loosing a lot of power since i got it. It runs really rough when cold and sometimes even when its hot. It has no power. Any ideas what this is and how you fix it?

Thanks Zach

 

efi temp sensor, throttle position sensor, timing....
lots of things can cause the engine to run poorly.
maybe a little info on the engine / transmission would help...
...mileage, etc.

 

It is an auto trans 4x4 of course, it has 152,000,

ive heard putting a manual transmission in will give it some more power but the price to do that is super high.

 

oh and it is a v6 3vz in it

 

so you got a 3.slow and the auto well theirs part of the problem

 

If you are losing power, try cleaning the intake (search). Seafoam works apparently.

 

Possibilities:
Plugs
O2 sensor
Compression

 

Im surprized nobody has mentioned GEARING!!! Looks like you are running good size meats. The automatic was undergeared from the factory. Those tires just made it worse.

Do a full tune up including: Oil change, plugs , wires, cap, rotor, air filter, o2 sensor and fuel filter...

 

3.4 swap

 

How should i change the gearing?

 

ring and pinion gearsets, front and rear.
gives the driveshaft more mechanical advantage over the wheels.
not something you would want to tackle yourself.

listen to some of the advice here about tire sizes and gear ratios, then get a mechanic to do the work.

 

thanks does anybody recomend any sites wear i might be able to get some of these parts that are reliable but not to expensive?

 

For ignition and misc parts:

www.sparkplugs.com

You should find out the stock gearing first. You can de-code the sticker on your drivers side door sill. Or do the spin-tire method..