And the car shaked to begin with, because the LR and RR rims met a curb and had yet to swap rims over from the other car to get rid of that, so they where slightlyflat in one spot

I doubt the shop blew the engine indirectly..

I still don't know what the hell it could have been then... Shall find out in a month or so when RX7 Speciaties gets back to us about it