Could someone help me diagnose? The 91 300te is running great but appears to be idling too high. When I had the car checked the local MB tech said it will not hurt anything, and it probably want..but I like things to work as they should.

Idle: no air on 1600rpm
Idle: with ac on 1350rpm
Idle: in gear 1000rpm

I am not very mechanically savvy so keep that in mind with your answer. The tech had the air filter off. He checked to make sure that the throttle cable was OK (and it was). He unhooked something electrical (it looked like it was going into carb area)...when he unhooked the car idled at 800rpm. He then hooked it back and rpm's went up.

Anyone have any ideas?

Thanks!

__________________
Rob Armstrong, Charlotte, NC
Mountain Island Lake
RobAinCLTNC@hotmail.com

2004 VW Passat GLS TDI-50k
2006 Honda Odyssey EX-L 7k
FOR SALE 1991 300TE 228k

2003 Subaru Outback 57k Silver/Black-SOLD
2005 C230K 18k Pewter/Grey-SOLD
1997 E420 108k Black/Grey-SOLD
1986 560sl 200k Black/Palimino-SOLD
1985 300sd 340k-SOLD
1979 240d 170k-SOLD
2000 Volvo V70XC-POS couldn't sell fast enough