Idle problems

[Stormboy]

Hey folks, i've got an AUII LPG auto 6cyl. In park it idles fine @ abt 800rpm, but whilst driving it is always wanting to almost stall when you back off the throttle at intersections etc. It initially only happened under brakes, which led me towards booster problems, but now it happens @ any speed. If i am doing 100km/h, and take my foot off the throttle, you can feel it wanting to stall and slow the drive train down. Put the throttle down again and after a brief dead spot, resumes normal revs @100ks. I replaced the booster but problem persists. any ideas? Much thanks.

[JC]

Originally Posted by Stormboy

Hey folks, i've got an AUII LPG auto 6cyl. In park it idles fine @ abt 800rpm, but whilst driving it is always wanting to almost stall when you back off the throttle at intersections etc. It initially only happened under brakes, which led me towards booster problems, but now it happens @ any speed. If i am doing 100km/h, and take my foot off the throttle, you can feel it wanting to stall and slow the drive train down. Put the throttle down again and after a brief dead spot, resumes normal revs @100ks. I replaced the booster but problem persists. any ideas? Much thanks.

Sounds like you may have a vacuum leak somewhere. Check the inlet manifold bolts, and all hoses such as PCV hose, MAP vacuum hose etc.