yes bhuff30 your on the same track that i'm thinking. this is my situation= a 1987 s/d efi used in racing at high rpm, head has been mild and ported, at end of race spark plugs are very white in appearance, not enough fuel. i think the injectors are at the 80% duty cycle now and i was wondering if i went with a bigger injector if that would help with getting more fuel? and also i plan on moving the ACT sensor from the intake manifold to the air inlet tube near the air cleaner where the air temp is much cooler. any help would be appreciated.