I'm taking a guess here that the fuel pump reset switch is inside the hatch area , just on the inside of the taillight area , covered by an oval rubber plug if I remember correctly that is where it was on my 1991 Ford Mustang
87 octane Regular.
87 Octane works fine if you are running stock.
" regular " unleaded , 87 octane ( according to the Owner Guide )
My 2004 Grand Prix GT2 runs on 87 octane just fine.
http://home.xnet.com/~paulv/MajorSpecs.htm Fiero Specs!!! 87 GT 2,708 pounds.
gas octan to high, use unleaded 87 gas, mustangs where set up to only run good with 87 octan gas. I use shell 89 gas every blue moon to help clean throttle body and raceway 87 gas any other day my car run alot better 1999 mustant gt convertible satin green with a pearl clear coat tinted windows trick flow headers cold air intake lowered 2 inches 44 flow masters bully dawg gt tuner 3.73 gears 580 cam etc
regular unleaded , 87 octane ( if the timing is set to factory specs at 10 degrees BTDC )
" regular " unleaded 87 octane for the GT Mustang
I have read that on an 87 GT its under the driver seat.
87
click on the button that says 87
its the traction control on/off button