1992 500sl Car runs great other than at idle. Plugs are new and vac. lines that were cracked were replaced. By slightly pressing down on air intake idle seems to be better. I though that there mite be a vac. leak but i cant find it.Thanks for any help

I had a similar problem and just had my oxygen senser replaced. That helped alot!

Regards,

PDX Ballard
'87 300E 250k...