My center support just let go on me 2 weeks ago and after towing, rental car and repairs I was 600 deep. It broke own on a Thursday , parts not available till monday, supposedly volvo parts 120, 300 in labor, 100 towing, and 120 in rental. I kick myself for not heeding the warning on the board, this should have cost me an afternoon worth of work and 40 in parts. The rubber burning smell means it is on its way out. so the sooner the better.
And another thing, I was going through my mental checklist as far as poor acceleration thinking bad brakes, tranny or tune up but I think I discovered that fuse 3 fuel pump was corroded and she is running strong(today anyway)