So, I ran into an interesting issue the other day. I installed a Pioneer AVH-4200DVD head unit (I'm pretty sure that's just a coincidence that it started happening after I installed it though, I don't see how they could be related at all), and now when I start the car while it's warm, it will die right away unless I hit the gas. If I hit the gas, the car will rev up like normal and then either drop to regular idle or drop to about 400 RPM and then raise back up to normal. When it's cold, it starts and stays running just fine.

My first thought was a vacuum leak, but I couldn't find one around my catch can (didn't check anywhere else, but I've had problems with my catch can before.) Does anybody have an idea what's wrong? It doesn't affect my driveability at all, it's just an inconvenience and kind of annoying. If it helps, my engine mods are an oil catch can, an Injen CAI, and a plenum spacer.

If this has been discussed before and I couldn't find it by searching, then I will call myself an idiot so nobody else has to, lol.

 

mine did this to me at a stop light before, i got out at a gas station and saw that the cai filter was loose and almost off, but apparently if you've opened the hood, you would see that, just a thought

 

Check your Cam Position Sensors/Crankshaft Position Sensor...I bet its one of those three.

 

yep, that too, those are a pretty penny

 

i had same type of prob and i replaced my camshaft position sensor it was $80 for the part.. after that prob went away..