I have a 1992 500SL. About 1 week ago it started acting up. Here is what is happening...

Runs strong up to about 70-80mph if i floor it and then it cuts the acceleration as if the traction control is kicking in and slows me down to around 40-45mph and keeps me there. At this point the accelerator does not respond at all. If I press and press it just keeps me at 40-45mph, the RPM sometimes will go up, but no power. If I slow down and then accelerate again, it has lots of power but as soon as I get above a certain point it cuts the power and i'm back to 40-45mph.

I've searched here and haven't found anyone with similar problems. The ASR light is not coming on. I don't know how to pull the codes (is there a write-up of how to pull the codes?)

Can anyone help??
Thanks,
Baktash
(512) 289-9397
baktasht@yahoo.com
baktasht@clearcube.com