my c4 vette idles fine when started cold . as it gets warmer it becomes hard to
running , until it just stalls . it has all the symptoms of a faulty iac valve. i
to apply more and more throttle to prevent stalling. also there is backfire when
back off throttle . no code is set .
any opinion will be appreciated . i have replaced tps, oxygen senser, map
for vacumn leaks-non found. egr working properly.
what is it ???
please anyone , help ...