car shake at stop light

[ric240c]

Hi there, i got a problem on my 240 coupe recently, mine is an auto, i feel my car shakes and my idle go up and down as i wait at a stop light, it only happen when i am on D position.. is that a tranmission problem? It runs perfectly tho. I have changed the distributor cap and rotor, battery , sparkplug etc.. the problem still exist.. Please help!
Modified by ric240c at 3:56 PM 3/28/2006

[BlackHat]

My 89 240 is a standard and has a similar problem. It will do that at idle and will also shudder pretty bad when I take off in 1st with low rpms. I think I've traced it down to dead motor mounts. May be something to check on yours as well.

I ordered the JGS MMs, I've not heard any feedback on them, but I'll be sure to give info when I get them installed.

[rogoman]

Several things to check:1 - sticking EGR valve2 - TPS harness connector pins; may need cleaning3 - possible vacuum leak4 - IACV unit may need cleaning

[BlackHat]

Would a BPT-EGR valve with a torn tube cause that as well? The shuddering I described that is. I noticed the vacuum hose coming out of the bottom of my BPT EGR valve is torn apart. I'm removing the EGR system before I drive it again, but was wondering if that could be my problem (I didn't know that would cause shuddering).