84chevylearner

I bought a 1988 cavalier as a junkyard warrior racecar at my local track. Im having issues with my throttle more then anything. Ive replaced my throttle position sensor and cleaned my injector and also swapped out my stock fuel filter to an inline clear filter. Car runs but as soon as i put full throttle to it it cuts out and has alil bit more then just an idle. As soon as i release the throttle its goes back to a fast idle. The throttle cutout starts at about half throttle. Just tryin to figure out why i cant get full throttle. its a little irritating