slight engine stumble, no codes...

[blackmax23]

When I'm sitting in gear, idling at a stop light, for example, I feel the engine stumble, drop about 50-100 rpm's, and it feels like it's about to stall, but never does. I have no CEL on, but I think this is a lil warning sign of a future problem. I'm meticulous when it comes to my car, so I want to get this taken care of before it becomes a major problem.

I'm thinking a few things could be wrong...coilpacks, egr valve, or IAC valve?

What do you think?

[tigersharkdude]

you might want to clean your idle air control valve. I had the exact same problem and when I cleaned the IACV it stopped. I took mine off the UIM and unscrewed the sensor from it and cleaned it with a dremel tool. It was completely clogged up with carbon build up.

[mrrbiggz]

also clean your egr tube. while you there pull up your intake manifold and clean the inside part where the egr bolts up to.

[NutriaforBreakfast]

Haynes has a very straighforward illustration of how to multimeterthe coil packs and check resistance, voltage, spark etc

[blackmax23]

Thanks, guys. Well now, this morning, I went out to start my car, started it, and rpm's jumped up like normal and then right back down to 0. Then again, then again. Then finally, I just held the key in the start position until it stayed running. It happened about 3 hours later, and I just basically held the gas pedal half way down when I started it and that seemed to work too. Is this the same issue or something else completely?!?!

[tigersharkdude]

IDK whats wrong with your car. We need some more info-

[blackmax23]

What more info do you need, I'll tell all.