OK, so I have learned to live with the stuttering problem at startup, but what is confusing me is this other problem I am having. After I get the stuttering to stop (engine temp is still on the cold side) in the mornings, I have great acceleration off the line. When the engine warms up to normal operating temps, the car becomes sluggish in acceleration in the same ambient temperature as the quick acceleration. It happens consistently every single morning whether it is a colder morning or a warmer morning, and at night as well. Totally dazed and confused about this one.

have u tried changing the air intake? to a custom air intake? i've did it and it got better. not fully cured but better

I know this is weird but I changed my pcv valve with a new one from Advanced auto parts and the stuttering stopped after a while. Something obviously is leaking when your engine itself is cold.

Also, correct me if Im wrong fellas, but what about a bad cat. I think Ive read a couple of places where when the cat is bad the car can become more sluggish than regular. Im trying to think if stuttering when cold is a problem too. Im trying to grab Ideas here to help you out with finding the issue. Check to see if there are any vaccumm hoses undone. If you havent touched on that yet.

Mmmm heat soak. I had this problem with a cone intake. Went to a CAI and for the most part resolved most of it. Had a little heat soak on hot days.

S

thanks for the help guys, I will try some of the stuff out. I already have plans for putting a used tranny cooler that I found laying around. It should work, pulled it off of a working car that we sent to the junkyard(a maxima that was given to us)

I thought that the hoses for the EGR would control that. It sounds like your car is dumping a lot of fuel until it warms up. What is its RPMs at while Idling?

the rpms are stable at around 1000 rpms until I touch the gas pedal, then it sometimes shuts off and sometimes begins to sputter and I hear a pop in the engine bay(the pop sounds like it may be coming from the air intake, i dunno)

MAF sensor?

It may be the MAF. But after I replaced mine three times I would still get the same thing. The way I got it to stop was by replacing all the air hoses for the EGR (which cost like .75 cents) and buying a new EGR valve and Sensor. I think thats what stopped it. There were a lot of problems with my max. Check for codes on your ECU to pinpoint the problem.

How is the car at WOT(wide open throttle)? If you step on the gas all the way, It could be the Oxygen Sensor, or your throttle position sensor.

When I installed my short ram intake, I had this problem too. Now to see if it still does it with the turbo on it.

Could be the MAF, Althought I swapped out mine and it sill did the same thing.

I have a similar problem on my '87 se. It stutters when accelerating from low rpms every once and a while, feels like a ignition stumble or fuel starvation. I have replaced all the tune up parts other than the plug wires. It has gotten better in the last few months but is really intermittent.

I'm just posting to say that on my 85, it ran perfect sometimes, and the al of a sudden would feel like it dropped three cylinders, then above 2500 rpm, would run perfect again. Only when driving. I had two thoughts: fuel pump, or stuck EGR. Well, just for S&G, I did a complete tune up, in stages, cause it was like 10 degrees. Plugs: no change. Cap and button ( which were original Nissan parts): litlle better. Wires: completely gone.

The point: never underestimate the importance of the plug wires. I've been mech'ing for 14 years, and never had a tune up make such a vast change in the running condition of a car. Ever.

Anyways, the new power killed the pass side axle, which was fun to change in the snow. Not really. Killed tie rod end in the process, which pissed me off cause I didn't even need to disconnect it. Anyways, just thought I'd share my story with you's guys.

hah i had to replace my radiator in the snow, i know what you had to go through