Where can I find info on a custom FMS chip?

Plugs could be the problem. As far as running rich/lean......does the engine knock? Do you have smoke coming out the tailpipes (after its been running) - and is there a heavy gas smell?

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'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach drag-launch spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; Cervini's 3" turbo hood; A/C-less; cat-less; 2 chamber Flos; Corbeau racing seats; FMS 30# injectors; JMS chip; Holley 190lb fp; TFS track heat Intake (12.299 @ 113 - 1.78 60')