I found a 1987 RX-7 for sale...the engine has been rebuilt, and the interrior and exterrior portions of the car are in fair to good condition. The engine had its rebuild 3,500 miles ago, but the owners are experiencing it die out at low RPM and starting trouble when the engine is warm. The asking price is 800.00 Is this a good deal...and what is this probelm they are experiencing and will it be alot to repair?