My first engine problem

[san rensho]

Originally Posted by Burg Boxster

Start by seeing if any codes are pending in OBDII. If it's running that bad some should be pending even though no CEL.

Otherwise, it's pretty much anyone's guess and you could spend a lot of time and $ chasing unnecessary parts...

Could be MAF (which you can try cleaning or disconnecting/running in safe mode), might be a coil pack (6k should have shaken any bad install out before now but look at them to see if any might be cracked), maybe AOS starting to fail but usually it'll just go w/ lots of smoke (pull off j-tube at TB and look for any oil pooling), vacuum leak big enough would trigger CEL before rough running would be noticed.

Good luck

Take off the oil filler cap and tell me your car doesn't run rough.

[wvboxst3r]

I will try that tomorrow. I have done that before and it was similar but not as rough. So I see your going with a possible vacuum leak but why would it get better in a few seconds.

[san rensho]

Originally Posted by wvboxst3r

I will try that tomorrow. I have done that before and it was similar but not as rough. So I see your going with a possible vacuum leak but why would it get better in a few seconds.

Good point. I'm assuming you have an e-throttle, but if you have a mechanical throttle,try cleaning the idle control valve.

I guess I would start with the easy stuff. Clean the throttle body, MAF and then if that doesn't help, try troubleshooting the MAF, but as someone else said, don't just spend $300 for a new MAF unless you are pretty sure thats the problem.

[wvboxst3r]

How do I know if I have an e-throttle or not.

[san rensho]

Originally Posted by wvboxst3r

How do I know if I have an e-throttle or not.

If you have a throttle cable, its not e-gas.

[vitaminC]

Many auto part places will read your codes for free, that's probably a good place to start.

What year and mileage is your car? I had some rough idle symptoms recently and it was two coil packs that went bad. Easy fix!