well, even with the pump gone bad, not sure it would even do 135...but it would run really bad, no accellation at all....I would think you would know if the SC wasn't kicking in....and popping up to 130-140 is a breeze in the srt....so someone isn't telling the truth...take it to an MB mechanic and have it checked out first....then make your offer, can't be much wrong to make her run....it could even be a bad belt, something simple...how many miles was on it???