Okay i had a problem with the car running around 3000rpm, it would sputter almost, i floor the gas it picks back up. So i went out got new NGK iradiums and stok spark plug wires, fuel filter and O2 sensor. I replace the rotor and cap about 6 months ago. So i start the car up and it runs fine for a few hours and now while im idleing it sputters like its going to shut off but it doesnt. When i turn on the ac it sputters more but yet i can gas it and it seems like its running fine. A while back when i put headers on my egr system mesed up...the computer says the egr is not working correctly, but that should mke a difference right? Any help with this, im lost.