Sounds like one or more bad fuel injectors. If you have any spare ones try swapping one side at a time with the ones on your engine. 

Joel

Sent from my iPhone

On Jul 26, 2012, at 1:14 PM, Jim Felder <jim.felder@GMAIL.COM> wrote:

> I've written a few times over the last week about my poor running 2.1.
> 
> First, it would stumble and die after starting. Replaced temp 2,
> replaced AFM. Much better. Ran deceivingly well for miles, but when
> asked to pull a hill, I had to back off on the throttle and crawl up.
> Any demand for fuel resulted in a loss of power that could only be
> recovered from by lowering the demand by backing off on the pedal.
> 
> Sounds like fuel to me.
> 
> Today I installed a new gas filter. I examined what came out of the
> old one, it looked to be half gas and half water. It doesn't run like
> there is a bunch of water in the fuel; it runs like it isn't getting
> enough fuel for the demands of acceleration and hills.
> 
> Which sounds like a fuel pump. It's pretty loud, and maybe it can only
> keep up with low fuel demand.
> 
> It has also popped its third coolant tank in two years, but that's
> another matter.
> 
> Other than the pump, anything else I should look at?
> 
> Thanks,
> 
> Jim