Whenever the car is under 3.5k rpms the car seems to shake and have a REALLY rough idle. So i go to pull the car over and step out and listen to the engine, like I said its got a really rough idle (seems like its missing). I checked my fuel pressure regulator and that reads normal, and my car isn't overheating or anything. I don't know what else to check for.... Do any of you know what might be the problem, I realize that there could be many things wrong but would just like somewhat of an idea. The only mods done to the car are I/H/E, so those couldn't of harmed anything. I plan on taking the car to get checked on tomorrow, but I'm just really antsy right now. Thanks for any help,
-Eric

 

Clean your IACV & check your spark plugs to start with.

 

tune up!

 

heh it just had its 60K service done bout 3 months ago.