It sounds like no turbo boost to me. The first place to look is for a vacuum line that was knocked loose. How was the performance before the A/C repair work? How is the shifting? Do you have a wagon 300TD or a sedan 300D? 10 seconds 0-60 is for the sedan and that is with everything in perfect order.

__________________
1987 300TD 309, xxx 2.8.2014 10,000 mile OCI


Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

“Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss