In a serious lapse of judgment yesterday, I took my 1992 300TE 4matic to a quick lube joint for an oil change. As soon as I got the car back, the engine didn't run right. I went back inside and complained, but they said they did nothing other than change the oil and the MB filter I supplied.

The problem is, when I'm in neutral or park, the engine visibly rocks a bit and sitting in the driver's seat, the car feels like it's moving in an up and down motion, but it feels fine at speed. But, when I'm at a stop and am idling in drive, (on a level or dowhill surface), and release the brake, or just tap the gas to get started, the engine mini-surges/revs which rock the car in a back and forth motion. At first I thought it was a transmission problem, that maybe they topped off the transmission fluid with a different type than was in there, and the transmission was slipping and grabbing, but now I think maybe a cylinder is misfiring, but I don't know. Any ideas what could have been done accidentily or incompetently to cause this problem? Or could it simply be a freak of nature, purely coincidental and unrelated to the oil change?? I checked all the plug wires and they are fine. I've sure learned my lesson, now I really need help. Thanks.

1962 MB 220SEb "Fintail' Sedan
1992 MB 300TE 4Matic Wagon
1995 Subaru Legacy AWD Wagon