Why does the idle bottom out when it drops from high RPM?

MK3_Turb0 · 07-10-2013, 05:57 PM

My engine cuts out whenever the engine RPM drops from over 2000+ RPM. For instance, whenever I pull the car out of gear at a light or to downshift around a corner, as the RPM drops, the engine stalls out.

It is frustrating restarting the car every few minutes and can be dangerous on turns when the power steering goes out.

Is this a vacuum issue?
The car is heavily modified and has an AEM ECU, though I don't think it is related to the ECU. It's been in the shop a couple times, but they can't seem to find the issue. YOUR HELP IS GREATLY APPRECIATED! THANKS!

07-10-2013, 05:57 PM	#1
MK3_Turb0 Stock Join Date: Jul 2013 Location: Colorado Posts: 1	Why does the idle bottom out when it drops from high RPM? My engine cuts out whenever the engine RPM drops from over 2000+ RPM. For instance, whenever I pull the car out of gear at a light or to downshift around a corner, as the RPM drops, the engine stalls out. It is frustrating restarting the car every few minutes and can be dangerous on turns when the power steering goes out. Is this a vacuum issue? The car is heavily modified and has an AEM ECU, though I don't think it is related to the ECU. It's been in the shop a couple times, but they can't seem to find the issue. YOUR HELP IS GREATLY APPRECIATED! THANKS!