[InstallTech]

At my wits end here. This is going to be a slightly lengthy post, but my head is splitting from trying to figure this one out for the last 4 months o so, and I figure it's time I bounce this one off some fresh minds.

About 4 months ago, took my Camry on a trip to Iowa. While there, the car up and dies. Afte sitting for about an hour, I manage to get the car started again, and got it back to my friends house. Came back a week later to trouble shoot.

Checked compression ( 180 in all 4 cylinders )
Replaced Spark Plugs
Replaced Plug Wires
Replaced Fuel Filter
Put in a gas additive to help clean out fuel injectors.

That *seemed* to do the trick. Ran great on the way back home, and didn't give me any more problems....for a couple of months.

Recently replaced the EGR Valve, plug wires (again, cuz one happened to be faulty), spark plugs (just to be safe), Distributor cap and rotor.

At idle speeds, after the car warms up and has been driven for a while, the car will want to sputter a bit. RPMs dip below 900 for a brief second every 10 seconds or so, and occasionally a couple of times in a row. If I nail the accelorator to the floor, the car sputters for a bit before it'll get enough gas to get the engine reving. If it sputters too much, it'll die and a whiteish smoke gets kicked back out of the intake manifold (I took the intake hose off to see if that had anything to do with it).

Car starts okay. Engine runs okay otherwise. It's an intermitant problem, but *always* shows up after I've driven for a while and the car gets warmed up. NO CHECK ENGINE LIGHT ever comes on!

I'm pullin' my hair out on this one. Could use some help/advice/anyone that's had the same problem and had it fixed