Get a fuel pressure guage that you can read inside the car and go for a drive. It sounds like your fuel pressure is dropping off under high load. Has the filter been changed recently? Even if it has, it may have clogged up if you had some crap in the tank.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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