i was just wondering what it could be...

but before my car gets warmed up
it stumbles in 4th gear (A4)
you can almost put it to the floor and it wont do NOTHING

it does this ONLY when its cold
but runs excellent when its warm
it only occurs in 4th gear (overdrive)

im running PIG rich if that helps anything

thanks!

 

I am thinking only a two things, that I think could casue that: IM leak and opti-spark. Since you say cold, i am thinkin' open loop and that rules out o2's and maf.

 

IM leak?

as in intake manifold?

BECAUSE, yes i do have an intake manifold leak (oil that is...)

could this be the the problem

 

anyone?

 

There's no way an Intake Manifold leak would be causing the stumbling. You have no EGR, which is what I was going to suggest. I believe that it is an exhaust leak, O2's or a bad MAF. The MAF can be taken out of the equation by disconnecting it when cold and seeing if it goes away. The O2's can be tested with something like datamaster or MAAYbe Autozone can do it. But even if you have an O2 reading high, you can still have an exhaust leak and the O2 could be good.

So, I would say O2 or exhaust leak if the MAF checks out.

 

its prob an o2 or exhaust leak (which i know i have)

i dont have a maf since my car is a 93 tho