i have a 86 mazda rx7 and am trying to get it running. i picked it up for 500 dollars and it wasnt running. the body is straight except the dent in the pass...fender. the guts is perfect but there a rip in the driver seat about 3 inches. when i got the car i was looking at the engine the previous owner said there was a short in the electrical and always poped the main fuse. i changed the fuse and glanced at the battery and notice they had it backwards. i turned it around and gave her a tune up and she fired right up. but the pulsation damper is leaking so i took it apart and and cleaned up everything. i put the intake back together and started it up.. it idles high then drops for 10 sec then shuts off.. any suggestions?