FI should not backfire through the intake, certainly not through the exhaust. After all this time, if the symptoms are both cut out and boom, I'd look more at the O2 sensor and worn out injectors.


1987 Raider - Roxy
1988 Mighty Max 2.6L Turbo - Pearl
1997 Mountaineer V8 - Freddy
2000 Excursion V10 - Freya