Wrapper

i have a 89 toy pickup that runs at a high idle it starts to warm up and
whan you push on the brake it starts to miss and the idle comes down low.
i checked for vaccum leaks and found none. i then went and pushed on the
pedel and held in the brake light switch and the idle would not change. as
soon as i let go of the brake light switch it would miss and idle would
come down. can you help??