i have a 1988 na gxl with minor intake porting an all that fun stuf.... i have pretty much typical exhaust intake that stuff... but yea so i got a safc 1 the first one yea yea i know its old school (matchs the car wink wink) lol but i got it for 40 bucks... but yea anyway i hooked up an its all right... started the car after i went through everything set it to 4 cyl an thrl up to the right corner... i went to monitor my throttle an i go to the % an i barly give it like not even inbetween 1/4 to 1/2 an its reading 100 % is there a way to fix this....i let it warm up drove it for 20 min then checked again still the same thing what can i do?

 

The S4 uses a narrow range TPS, what you experience is completly normal. The best way to fix this is to search the SAFC section in engine management, and use the boost pressure sensor to adjust the fuel.