Hey guys ,here's the scoop.My 90 rx7 was running like a top,then one day ,I was parked on a hill then proceeded down the hill at basically an idle for about 1-2km.stopped at the stop sign at the bottom of said hill,eased into the accelerator in first and then there was an audible POP,I;m guessing a backfire now the car runs like crap .Symptoms include very hard to start,wont idle unless I am giving it fuel,and next to nothing for power.I have changed plugs,and fuel filter????Help!

 

For starters:

http://www.banzai-racing.com/FD&S5_error_codes.htm

 

And compression test.

 

whatta shame.